Fabbster testing and setup

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The Fabbster is a low cost 3D printer kit that can be assembled by people with some do-it-yourself skills.

Important. This article refers to a "pilot program" printer and the draft manual version 1.10 and not the "final" home-user version.

This article explains:

  • How to conduct some initial tests with the SD card
  • How to install software
  • How to conduct some initial tests with the Netfabb software
  • How to calibrate the platform

Disclaimer: This is a rough draft so far - Daniel K. Schneider 19:05, 30 April 2012 (CEST)

See also:

First installation tests

Recall: Do not close the case yet. Your wiring may be wrong and you will have to fix this. You also should have a view on the LEDS (see below)

The following is a summary of fabbster wiki notes and forum posts. Do not trust this yet. Also, do not fully trust information at Fabbster. Some stuff is contradictory, e.g. installation tests says that the first move with the AUTO.BGC file is front and a few lines down it is back. The truth is rather that it moves up/right/back and then down/left/front and then repeats.

Let's just shortly describe the workflow of 3D printing. Read the workflow model in the 3D printing article

  • You can create a 3D model with all sorts of programs, e.g. with a so-called 3D modeler or a CAD program
  • This model must be "closed" (watertight), i.e. it must not have any holes
  • It then must be exported to the STL format
  • The STL format must be repaired (very likely if you user a 3D modeling program made for 3D scenery), scaled (very likely) and positionned. You do this with the Netfabb program
  • Once you have a correc STL model, it then must be translated to machine code, also using Netfabb.
  • The machine code (*.bgc) is then sent to and executed by the printer.

Before we print, we must test if the fabbster is correctly assembled. This involves several steps.

Testing if the motors are connected

This will just test if the motors are connected, but not if you did it right.

  • Move the extruder (thing in the middle that moves left/right) into the middle with respect to all axis. In particular, move the x-axis up the z-axis (i.e. just push the thing in the middle upwards ...)
  • Switch the fabbster on
  • If you can't move any of the motors, then they have got power. Do not push, they will hate you !

Switch off again and have a beer. Maybe you soon will be done, maybe not :)

Test #1 with SD card

Simple movement test

Note: You could skip that test and directly test movements through Netfabb too, but this file will do a standard test that doesn't require understanding Netfabb (see below for details).

(1) Get AUTO.BGC from Fabbster

This will allow to drive the Printer from an SD card

  • Download auto.bgc from http://wiki.fabbster.com/File:Auto.bgc
  • Rename it to AUTO.bgc (Yes: UPPERCASE name and lowercase extension.)
  • Get the card (you either put it aside or it was taped in the e-box)
  • Copy to the card

(2) Insert the card

  • Picture on the SD card should be to the left. It should snap

(3) Move the three cassettes in middle position. That includes moving up the x-axis in z direction. If you don't understand this: Just push the thing in the middle upwards.

(4) Power on

  • Green LED should be blinking
  • Blue LED should be on (steady)
  • Read LED also on (steady) ?

(5) Press the start button for more than 5 seconds (little black button in front of the lower board)

  1. The red and the green LEDs light up.
  2. After 5-10 seconds:
    • the red LED switches off
    • the blue LED is on (steady or blinking ?)
  3. After 10 seconds:
    • Extruder should start moving (see below). If it doesn't, switch the fabbster off
    • Nozzle should be warm, i.e. neither cold nor very hot. If it will heat a lot, then temperature sensor isn't connected or working ...
  • LEDs:

The red LED indicates that the extruder is heating. The blue LED indicates that the extruder has reached the set temperature

(6) Extruder test movement should start after 10 seconds

  • The extruder should be moving to the right top direction and the platform should move to the back (fabbster wiki says front but that should be wrong). This means all axis are moving in positive direction. See also the next item

(7) Summary of good signs

  • first move is up in Z
  • first move is right for the extruder
  • first move is backwards for the platform
  • fan is turning
  • nozzle heats up to 60°C (if you have heavy burns on your finger something is wrong)

Trouble shooting:

  • If an axis bangs against an end, then you will have to change the wiring (not difficult). Just do it right :)

(8) Add the platform

  • Just screw it on top of the cassette that moves in the Y-direction
  • Yes, the Fabbster seems to be a modified Mendel design ....

Trouble shooting for Test #1 with SD card

Here are a few things that can go wrong:

(1)Fabbster moves in some wrong direction

  • If the extruder was moving down first instead of up, change the connectors of the Z-motor on the yellow/red pair of cable in the elreectronic box.
  • If the extruder was moving to the left change the connectors of the X-axis.
  • If the platform was moving backwards, change the connectors of the y-axis.

(2) fabbster does nothing

  • within 60 sec after pressing the start/stop button for 10 sec.
  • All LEDs may be blinking in addition.

Possible Reasons:

  • The fabbster can not read the file AUTO.BGC on the SD card. Make sure that the file is there.
    • My story #1: I named the file AUTO.BCG instead of AUTO.bgc ... All three LEDS were blinking
    • My story #2 (after inverting the heat sensor wires): I named the file AUTO.BGC instead of AUTO.bgc
  • The fabbster cannot read the card. Try another card, wiggle the card in the slot, etc. It also may have bad contact. Bend down the SD-card holder contacts or more easy and safer: apply two layers of clear tape to the back of the SD-card...

(3) The fabbster is moving some millimeters and then the three LEDs start flashing

  • The temperature coupler is not connected right. Open the case and check if there is a red dot on it. Yes, you will have remove the plate in order to find out...
  • If it does have a red dot, then you must turn the male connector, i.e. invert black/white cables somewhere. Read step 31 in our assembly article. I explained what to do
  • This also happened to me, but I only figured it out after using the Netfabb engine for testing. (Didn't understand the name problem of AUTO.bgc)

(4) Nozzle starts smelling and gets very hot

  • The heating wire has a short circuit fault.
  • Redo the winding of the heating wire
  • Inspect it from something that is broken, sticks out
  • etc...


  • You also can test through the netfabb interface. See below.

Other fabbster test files

Netfabb provides other test files, but I suggest to install the software first (see further below) and then, rather execute these testing files from the Netfabb software (see below).

These test files are only accessible to fabbster pilot customers !


File download:

  • Log in to the Forum (as pilot participant !!)
  • Click on the titles of the Wiki sections (above) ... as of April 30 2012.


There are three LEDS that sit on the lower board. So you only can see these if the case is open.

  • red indicates that the extruder is heating.
  • blue LED indicates that the extruder has reached the set temperatur.
  • green LED indicates that the system is working.
  • All three LEDs indicate an error

Read also

Software installation

In order to operate the Fabbster printer, you must (for now) use the Netfabb program. Open source printers work with several programs, fabbster is closed source and does not. So install it. In addition, you will have to install a device driver.

Log in to the fabbster forums first. Some files may be read protected for other people, i.e. you may need a cookie.

In principle, you don't need to connect the PC to the fabbster for printing. However, since the fabbster doesn't have any control board (like the Rapman for example), it's not a good idea to print from the SD card only. However, if you must, you can:

  • Generate the G-code with Netfabb
  • Then copy the file to the SD card and name it AUTO.bgc. Any other name won't work.

"bgc" stands for "binary g-code".

You also could copy several bgc files to the SD card and then send them from the Fabbster software (version 4.9 and later)

Installation of Fabster device driver

This will allow the PC to connect with the Printer board. Without it, you cannot send anything to the printer from your PC, i.e. the Fabbster software will not work.

  • Get the driver from http://wiki.fabbster.com/Driver (you may have to login to the forums first)
  • Unzip the archive somewhere
  • Download the Netfabb manual. Yes, the installation of the driver is hidden in Chapter three.

Driver install

  • Turn on the Fabbster
  • Connect the printer with a USB port using the USB host cable (Always use the same or re-install)
  • When you get the message that tells you that no driver could be found, don't worry (yet)
  • So open Control panel, material and audio, peripherals and printers. (rough translation from french). The Sintermask Fabbster should be there. Right-click and play for a while with the buttons until it is installed. Ignore any warnings, just do it and repeat (Windows style) ;)
  • If it's not there, then open the Device manager' and do it from there as explained in the manual

Installation of Netfabb engine

This program will

  • Allow to translate STL files into machine code according to parameters that you can set. That includes generating a raft, fills, layer thickness, etc.
  • Position a model in the right position with respect to the building platform's coordinates. Typically: Bottom should be on z=0
  • Repair an STL model. A model must be so-called "watertight"
  • Talk to the fabbster for sending print files or moving the extruder/heating etc. manually.

Download from there:

Find the voucher code:

  • The serial number and voucher code is in principle printed somewhere on a sticker outside of an e-box halve (big white sticker)

Install it:

  • If you can't find the voucher code, select the demo version (aka basic)
  • After filling in your mail you will get an unlock code.
  • Enter the voucher code.

Configuration of Netfabb

Verifying the configuration Netfabb is important !!!. Do not skip this ...

  • Read again this Nf installation article at fabbster.
  • Depending on the version of Netfabb that you downloaded, default settings could be right, e.g. version 4.9.1 is pretty much ok, except maybe for the platform size and the temperatures for some ABS.

(1) Configure Machine (select the machine type) and click on the .... next to Machine type:

  • homing must be off (both before and after printing, else the extruder will run away and find no stop sensor since there is none !)

According to information found by the end of April 2012, but that may have changed:

  • XY and Z acceleration must be set to 3
  • Move z down must be set to 50mmm

(2) Configure Style:

  • Click on Manage materials (tab at the bottom)
  • Now for each plastic check the temperature
    • For ABS, I suggest picking a range between 250 and 270. ABS starts melting around 235, depending on the brand and color. PLA plastic is much colder !
  • Jump Tab:
    • In the experts settings, Jumps tab, untick always stay over filling

(3) You could adapt platform size in the STL manipulation program (click on "parts" in the top right panel". However this is not necessary. It just will give an intuitive feel of the space you could use.

  • Menu Settings: Default platform size. I used 250 x 250 x 250, it certainly is not 40 x 40cm !.

This configuration is by no means complete. Once you start printing for real you also have to adjust some parameters with respect to:

  • plastic that you are using (various sorts of ABS or PLA)
  • print quality
  • object type (e.g. printing a naked model doesn't follow the same logic as printing a DUPLO block)

In other words, you may have to create new profiles. For starters, I suggest just using the defaults.

Note about the Pro Version:

  • Its main advantage is that you can glue STL files together. This is IMHO, from what I remember without checking. Way in the past, I bought two Pro versions for the RapMan but I didn't use the slicer program since I found skeinforge easier to manipulate for my purposes. I.e. I only used Netfabb for STL repair, 3D lettering, positioning and STL gluing in the past.

Simple tests with Netfabb

Before you turn on the machine, move the extruder to x=middle, z should remain down. The plaform also should be in the middle (y=middle).


  • Select fabbster (top right panel)
  • Select USB Control
  • Hit connect button

Extruder motor test

  • Power up the extruder (16 RPM will do).
  • If you hear a noise then you are ok

Temperature test

  • Hit the set button next to temperature
  • Set to 60 unless you want your fingers burnt
  • If all three LEDS start blinking, then you likely got a temperature sensor that has a red dot, meaning that you must exchange male and female wires. So open up the extruder and check this. Happened to me  :( - Daniel K. Schneider 22:39, 26 April 2012 (CEST)
Testing extruder speed and temperature with Netfabb

Motor test

Select USB Control tab

In the Device control section, select Movement:

  • Press Activate Control
  • x-axis: LEFT/RIGHT should move the extruder left/right
  • y-axis: UP/DOWN should move the platform backwards (up) and forwards (down)
  • z-axis: PG UP/ PG DOWN should move the extruder up/down

Now that the fabbster seems to work, you must calibrate the platform.

Extra tests

You now can do the tornado (see above) if you like.

  • For the Tornado test, make sure set the extruder to 0,0,0 (left, plattform back) !
  • Then either rename the file to AUTO.bgc or just copy the file to the SD card as is. In the latter case, use Netfabb to launch it.
  • To print from Netfab:
    • Select USB Control
    • Browse SD Card
    • Select File and Start Build


  • Printer will move left/right, forward/backward and "work up the z-axis".
  • Nothing should touch either x or y ends, i.e. you the extruder will not crash into one of z-axis and the platform will not bump into the cassettes in the back or front.

If you want to do the extruder test (strongly recommended), mount the platform. No need to calibrate a lot. However, the nozzle should not sit on it, i.e. it must be at least 0.1mm away from it.

Extruder test

  • Donwload the Like3min.bgc file from the fabbster wiki (or from a forum post)
  • Insert a stick into the extruder
  • Open Netfabb USB Control -> Print Files -> Browse SD Card
    • Select file LIKE3MIN.bgc
    • Execute it, i.e. Press start build
  • Extruder will move up a bit, then start heating. Temperature should raise, i.e. you should see this in the control panel !
  • Extruder will move up again and to the middle and start extruding
  • The whole plastic stick must be gone (else you got a problem)
Testing extruder. Temperature raising :)

Now, move on to platform calibration...


  • Executing this file is a smart idea, after you change plastic. Make sure to eat up quite a lot of plastic when you change from white to yellow or worse from ABS to PLA and the other way round. Of course, you also can do this through the Netfabb control interface. Move the x-axis up before you extrude.

Disclaimer: I don't actually know if it is a good idea to heat remaining PLA to high ABS temperatures. Maybe you should consider removing it first through reverting the extruder.

Platform calibration

Now, mount the platform. Just screw it onto the cassette that sits on the y-axis (forward/backward).

Switch off the fabbster. Remember that you never should move a motor while under tension. Else you can leave it on, but then move the motors with your keyboard (as explained above).

There is not much you must/can calibrate. You only can make sure that the nozzle is close enough to the platform, i.e. about 0.5mm or less.

  • The height must be adjusted by turning the 2x2 bolts that stick out of the z-motors on both sides of the x-axis. Lift the extruder (x-axis) up and turn in/out the screws.
  • Start with a distance of about 18mm and then turn them in. Mine are now at 16.7mm and maybe lower later...
  • Caution: don't let the axis drop down. It could damage the nozzle.
  • The nozzle should be as close as possible, e.g. 0.5mm is just fine, less can be better. Use a pile of 5 sheets of paper and if it moves underneath the nozzle but sticks a bit, then you got 0.5mm.
  • Make sure to move both the platform and the extruder around and check that the nozzle does not touch anywhere for now. Later, you can play it closer. Just do it manually but with the power off of course (else you will damage the motors).

The platform seems to be uneven. However since you can't print wider objects without a heated platform, it doesn't matter if the outside is bit closer. Just make sure that the nozzle won't drive into the platform. Also, generated g-code likely will lift the nozzle a bit before printing (I have to check how much the default is)

Tips for later ....:

  • Heat the nozzle to full temp before you print a test file. This way, if it drives into the platform it won't be harmed ;) Anyhow, if you upload a file from Netfabb, the printhead will automatically move up for heating and the go down again.
  • Read the instructions in the Netfabb wiki on how to set up Netfabb.
  • You only can print using a fat raft, i.e. a piece that will stick to the bottom of your model and that you later will have to rip off. The Netfabb software will automatically generate one for you. Though make sure that the raft is big enough, else it won't stick. )
  • If you drive the nozzle cold into the platform you can damage the nozzle. If it is hot, it does not matter, so do no worry if the pillar raft creates little holes. Of course, you only can do that if you play it really close and that's what you should. PLA printing is a different issue. In principle one does not need a raft, but maybe on a fabbster one does.

First print


(1) Make sure that you configured Netfabb like you should (check above again)

(2) Before you turn on the fabbster, check if it is "homed", i.e. x=0, y=0 and z=0

  • Move the platform back
  • Move the extruder left

Before you continue, you should know that Netfabb includes three programs:

  • an STL manipulation and repair program
  • A "slicer" program that will translate a "good" STL into machine code.
  • A control program that allows you send files and commands to the printer (right part) and to monitor a printing process.

For now, we just will use the slicer and the control program.

Basic workflow

(1) Import to the slicer

  • Select Fabbster in the top right panel
  • Right click -> Add part (or use the file menu)

(2) Position the model

  • Often STL models will be positioned at x=0, y=0, z=0 (lower left corner of the virtual platform in Netfabb). The fabbster wants the model to sit somewhere in the x/y middle (about x=12.5cm, y=12cm), because this respects the logic of its design. Other printers like the RapMan want the model to sit in the lower left corner.
  • In order to position, select the model, then use either the Menu: Parts -> Move or move it manually using the "views" on top. Click on each cube. Start with the "top" view and get the x/y position right.
  • To test if the bottom of your model is a z=0, (precise x/y won't matter a lot), click on the "Information Cube" (also on top). To move a model in the z-axis (sometimes you also will find such models) I rather suggest using Menu: Part->Move
  • Make absolutely sure that the model doesn't extend into the z-axis. Again, hit the "information cube"
Positioning a model with Netfabb in the parts tool. Same operation in the fabbster tool ...

(3) Define the settings

  • For your first print I suggest using default values, but you still need to make a few choices
  • I selected "strong traditional raft" in my first attempt but it is by no means strong. I'd call it weak and it was weak since it did not stick. Ok, I could have raised the print bed a bit. Real traditional rafts are shown here
  • Therefore, select "strong pillar raft".
  • Select the color of your plastic, e.g. LIKE ABS BLACK
  • Never use a support type (unless you know what you do)
  • Select BALANCED or DETAILED, else the print will be really ugly

(4) Translate to machine codee

  • Hit Calculate toolpath
  • You can move up/down the glider to inspect the sections.

(5) Insert the plastic into the extruder

(6) Print

  • If not already done so, connect to the printer (USB Control tab)
  • Insert the SD card, any file that you send from the computer will be put on the SD card (if I understood right)
  • Hit the print button or save as BGC.
  • Since the file may take a long time to upload, saving it as bgc and copying to the card is an option

Trouble shooting

Raft does not stick

  • If the raft doesn't stick you could:
    • augment the temperature, e.g. 250, 260 or even 270 degrees. Since the raft will be printed with the minimal temperature set the min. to about 250 at least. Too much is not too good, because you won't be able to remove the raft without using major force, i.e. a sharp kitchen knife (the spatule won't do)
    • Recalibrate the platform: Move it up, i.e. only leave about 0.1 mm between the nozzle and the platform in the home position (front left). It is likely that vertical distance is bigger in the center. If the nozzle moves a bit into the platform while creating a pillar raft it doesn't matter much. A hot nozzle can't be damaged, a cold one could !!
  • If the model doesn't stick to the raft you could:
    • get angry, it should :) See the expert settings for configuring a different raft.

Raft sticks too much

There are two methods

  • Unscrew the platform, then use brute force (but don't get hurt, the provided tool is dangerous and has sharp edges !)
  • Use a cheap long flexible kitchen knife with teeth and "saw"

Next time, you also can try using a lower min. temperature, e.g. 250 or using a less "fat" raft. I personally prefer the kitchen knife solution.

Object is a mess (your fault)

  • Check if the bottom of your model is at z=0. In particular if you get something like this:
Bad Z-positioning of your model. It floats above ground
  • The printer simply prints on thin air. That type of printer cannot ...

Object is a mess (not your fault)

I had a y-offset problem for now and had no idea why

  • If there is such a problem, then contact the fabbster forum or better send a support ticket, e.g. below is my second print of a very simple tugboat.
  • The reason for such a problem is probably either a bad contact (signal doesn't go to the motor) or a defective motherboard (digital is not converted correctly to analog). In my case, a board was defective. After a change, the fabbster does print well.
Offsets in the y direction

Warnings and open questions

  • Home to reference point doesn't seem to work. The extruder goes up and starts banging against the top
  • I didn't manage to pause.
  • Let the print head cool a bit before you turn the machine off (Fabbster could make a hole in the home position). Another solution is to dig a hole into the platform at x=0 / y=0 :)

Filament doesn't come out

You may be used to much slower 3D printers, e.g. a Rapman and even may have a whole stack of plastic rolls left.

  • With the faster speed of the fabbster, temperatures must be higher or you don't get good flow. For yellow BFB ABS I used min. temp = 250 and max temp = 270.
  • In addition, and this is important if you don't want to become very frustrated: Extrusion speed must be at last 10 RPM if you use plastic rolls.

In other words, too low temperature are bad and too high is bad. Very low extrusion speed and very hight extrusion speed is bad. Figure out what works on yours and read Netfabb engine for RepRap‎‎. At some point you must learn how to define build and material styles. If you want to print with plastic rolls (as opposed to stick), you really can't avoid this ! People do share print styles on the fabbster forums.

Also the nozzle may be clogged a bit. In that case:

  • Power off
  • Push x-axis up and stabilize it, e.g. with one of the white cardboard boxes
  • Power on
  • In Netfabb under USB Control set temperature to 260 or more (for ABS), much less for PLA of course.
  • Then, extrude around 70 RPM
  • Then, push in the filament (gently !!)
  • Then, once it starts flowing normally, extrude at least 3 metres (I am talking output here)
  • If you can't push down, then extrude negatively (hight RPM) and pull the wire up. Cut it and insert it again.

Print doesn't look that good

My second print looked like this:

Second print with default "balanced setting", e.g. medium quality

Things to do:

  • Print with "detailed settings" if you have sticks. Do not try this with plastic rolls !
  • Change the expert settings, i.e. define a new print style. E.g. it is possible to print fatter layers at lower speed that way. (see the link just below). The new print style must print above 10RPM !
  • For overhangs, it is good to work with minimal temperatures. That also implies that you must slow down, or filament will not flow well enough


Second print

Now let's first repair/check an STL file ...

STL manipulation with NetFabb

(1) Get an STL from a place like Thingiverse.

(2) Load the STL file into Netfabb

  • Select Parts in the top right panel
  • Menu File -> Open. Then select your .STL file
  • If you can't see the model: Click on Parts (top right) and make sure the eye that shows the file name isn't closed
  • Show the platform: Menu View-> Show Platform
Testing extruder speed and temperature with Netfabb

(4) Scale the model if needed

  • Menu -> Part

(5) Position the model in the center

  • ... as explained in "first print"

(6) Repair the model !!

  • Click on the red + icon if you see a warning
  • Accept the modification ...

(7) Save the model as STL. Menu: Part -> Export Part -> as STL

  • Choose a new file name

Use the Netfabb slicer

As above for the first print


With the fabbster one can in principle print several kinds of Polymers (only ABS and PLA tested so far)

  • ABS is solid, somewhat easier to print if you stick to objects with small width and length (both x and y less than 4cm I think). Temperature range 235 - 280 degrees. So far, only ABS really seems to work with the Fabbster.
  • PLA is less solid, but it warps much less. Temperature range: 200 to 210 degrees (not tested so far). PLA is overall the best bet for "just printing for fun". It's ecological and it doesn't warp and it's least poisonous. With respect to ABS make sure to extrude more and keep nozzle really close to the previous one. So far, I did not manage to print a "serious" object with PLA.
  • HDPE warps worse than ABS and needs slow printing. In addition it would need a special print bed made out of PP/HDPE. E.g. use a kitchen plastic chopping board
  • LDPE ?
  • PP warps a hell of a lot and needs very slow printing. Printing in a very warm room helps (35 degrees)

Read also:



Copyright modification

Contents of this page is available as CC-BY, meaning that commercial sites can reuse and remix text or pictures if they cite us.

In addition, Sintermask/Fabbster can copy/paste both texts and pictures associated with this article to their support sites without needing to cite us.

However, given the doubtful quality of the pictures made with a cell phone, I doubt that anyone would like these ;)

- Daniel K. Schneider 22:08, 25 April 2012 (CEST)