Netfabb engine for fabbster build styles

Introduction

This article presents and discusses some simple build styles for the fabbster 3D printer and that can be imported into the Netfabb engine for RepRap

If you are not familiar with expert settings, you also should read:

• Netfabb engine for RepRap (or equivalent in the netfabb wiki.

Alternative sources:

• Application and buildstyle (fabbster forum)

Design principles and general tips

These styles, so far, were made for printing with plastic rolls. As you can see in the picture below - "Angelina" style behind and "Vanessa" style in front to the right, it's fairly easy to get decent enough prints using 0.25mm layers.

However, it may take about five attempts to get it right as the series of the small models in the picture shows (first attempt to the left left, first decent version to right). Creating a more universal style would take more time since you would have to test it with different objects and also make sure that it works with different sizes ...

Angelina and Vanessa styles - Vanessa to the right (the others are other earlier attempts, DUPLO far right made by Lego)

Important general tips (read this please!)

(1) We set a lower limit of 10 RPM printing (unless otherwise specified). This makes printing with these styles fairly easy. If you change the styles keep this principle unless you know what you do. RPM can be seen in the calibration settings or by using Olaf's excellent style editor (dig into the forum messages for finding the latest version. You can safely use this editor for inspection, I don't know if it is already safe for editing - May 31/2012).

(2) Each build style has an associated material style. Typically, we use 0.25mm layers as opposed to 0.15 layers. Using our build styles with default fabbster material styles simply will not work !

(3) Make sure to get the temperatures right. I typically use between 255 and 270 degrees.

higher temperature = easier flow (plastic comes out). But never go above 290 or you might produce glass instead...

lower temperatures = better quality

If no plastic comes out with my settings:

• Raise the temperature a bit (by 5 degrees)
• Make sure that the print head starts really close to the board (2-3 sheets of paper underneath)
• Turn down anti-stringing

... Again, read Netfabb engine for RepRap if you don't know how to do that kind of thing.

Importing and exporting styles

You can import these settings to your Netfabb. To visualize if you are afraid, open with an XML editor or use config.html (an XSLT script that will show contents as ugly HTML).

To make our styles work you need to import both a build style and a material style ! These work together. In the Material style you would for example define layer size and definitions of speed and width. In the Build style you define how to use these definitions within different regions.

In Netfabb:

• Open Manage Materials, and right-click->Import. Choose a "reprapcalibration file" !
• Open Manage Build Styles, and right-click->Import. Choose a "reprapbuilstyle file" !

See the screenshots below:

Importing/exporting Material styles

Importing/exporting build styles

You will have to select a filling:

• I suggest a minimum filling unless you print objects that must be strong. Move the slider rather to the right for less fill. All to the right is OK for larger objects that are not meant to be extremely solid.
• You may have to adjust the temperature. I tend to use low temperatures (as compared to others in the fabbster community) and I even may try lower in the future. High temperatures are better for good flow, but increase warping and worsen overhang problems.

Reusable ABS styles definitions

Angelina style

Purpose: This style does mostly what is explained in the "calibration for dummies" section of the Netfabb for RepRap article. It is not a very precise style, but it prints larger objects ok and fairly fast and it uses 4 walls to make them fairly solid.

Get the latest combination from

• http://tecfa.unige.ch/guides/3dprinting/fabbster/styles/angelina/

E.g. as of May 18, these are:

• angelina-5.reprapcalibration (Material)
• angelina-5.reprapbuildstyle (Build Style)

Main features

• 0.25 layers
• medium/slow and medium/fast combinations
• Walls are 4 think (outer, inner1, inner2 and inner3

If your object includes smaller parts, try the "Uma" style. It's sort of combination of Angelina and Vanessa.

Angelina and Vanessa styles - Vanessa to the left, Angelina in the back

Vanessa style

Purpose: This is another 0.25 style / material combination for "artistic" hollow objects. It is meant for printing out more slowly and it only has been tested with a small hollow object, i.e. the same pink panther woman on Duplo as above, only 8 times less volume. Think of Vanessa as Angelina, Lego sized. It is not a precision style, but should produce acceptable quality. For higher precision styles, see Tinman (fine layers with medium speed), or R2D2 and Uma (0.25 layers at lower speeds)

Style settings:

• Most width are fine
• Walls only have an outer and inner definition (two instead of four as in the Angelina style)

Material settings:

• It goes down to "snake" speed, however, snake means 25 mm/s in our associated Material style definition.
• No up and down jumping of the print head during jumps ! In other words the print head will move in a more quiet way. However, this means that some objects may not be printable. Print head could rip off the model if something sticks out.
• Minimal RPM is around 10. I.e. everyone should be able to use this style with plastic rolls.

Directory with build and material style:

• http://tecfa.unige.ch/guides/3dprinting/fabbster/styles/vanessa

Todo/Problems:

• Upper skins with a slight angle have holes (the upper side of her chest). Needs an extra region definition, but I have to figure out how to do this. One should (but can't) define a new small area that only would work if there is an angle from 5 to 30 degrees.
• The small region prints are too fast. I should take the settings from R2D2 in the same way as Angelina would need the small region settings of Vanessa. See the Uma style for better quality.

R2D2 style

R2D2 style

Purpose: It is meant for printing out fine details slowly. This 0.25 style / material combination is meant for small "technical parts" like a hose retention clip posted by Gizmo in the Fabbster forum. However, it will not print at very detailed resolution since this simply can't be done with plastic rolls using the current extruder.

Style settings:

• Practically all width are fine and speed is mostly "snake" (25mm/s)
• Walls have 4 parts (or less if the wall is smaller)
• No up and down jumping of the print head during jumps ! In other words the print head will move in a more quiet way. However, this means that some objects may not be printable. Print head could rip off the model if something sticks out.
• Minimal RPM is around 10. I.e. everyone should be able to use this style with plastic rolls.

Directory with build and material style:

• http://tecfa.unige.ch/guides/3dprinting/fabbster/styles/r2d2

Important settings:

• Set Fill spacing to none: Slider in the Print panel to full left.
• If you print very hot, then you may get "noise" and the print head may rip off the whole thing. In the Material expert setting, set Z Offset in the Jump tab to something like 0.5mm. You also can lower RPM a tiny bit.

Todo/Problems:

• Better testing with other small technical parts
• Reduce flat areas a bit. That may be difficult, since I do want to stick to a minimum of 10 RPM right now. But a slightly "thinner" Material style should work.

Hal style printing: Tiny hand to the left, the others (medium and large) are Uma style

Print two next to each for cooling down

Hal style

Purpose: It is meant for printing out small delicate objects as slowly as possible. This 0.25 layers style / material combination has been tested with a small Lego piece and a hand on top. However, it will not print these at very detailed resolution since this simply can't be done with plastic rolls using the current extruder.

Style settings:

• All parts are fine and speed is always "snake" (20mm/s), 9 RPM
• Walls have 2 parts (or less if the wall is smaller)
• Print head does up and down during jumps. Else it might rip off something
• No anti-stringing. This means that the printed piece will need some post-processing (cut/burn away strings)

Directory with build and material style:

• http://tecfa.unige.ch/guides/3dprinting/fabbster/styles/hal

Important settings:

• You may have to print double objects next to each other. Otherwise, the plastic will be too hot. In that case you must find a good temperature. I print 5 degrees higher than usual. This is bad for quality, but good for plastic coming out.

Todo/Problems:

• Try a version for sticks at some point ....

Uma style printing

DUPLO with bike - Uma style

Uma

Uma is a fairly solid and somewhat detailed 0.25mm layers style. Meant to be used for objects like duplos and figures that sit on top. However, very fine parts may not render well since the style is quite "fat". As all the others, it may need some further testing and tweaking

Build style

• 4 Walls
• High overlap with filling (meaning that it can print flat roofs)
• 4 upskin and downskin layers (creates solid roofs)
• A special first 2 layers definition (a bit fatter)
• 3 regions that are all fairly detailed

Material style

• 0.250mm layers
• Raft: Lower speed, distance Grid/Part a bit lower (0.2)
• No Z Offset with Jumps
• Slightly lower anti-stringing

Variants

• Uma-2 has thicker first 2 layers and maybe some other changes I forgot. If you print two objects side-by-side, you maybe should raise the temperate a bit.

Settings

• For DUPLOS with hollow objects on top, I'd use a rather low filling (after all she got 4 walls)
• Temperatures should be as low as possible, i.e. plastic must come out nicely. Since ABS properties change, you may have to adapt a bit. E.g. Go higher for fabbster ABS. Test flow by setting RPM to 10.

Directory with build and material style:

• http://tecfa.unige.ch/guides/3dprinting/fabbster/styles/uma

Nut and Bolt (Thingiverse) - Tinman style

Tinman

This is a 0.150mm style. It is meant for printing small solid objects (nuts and bolts). It is used with a standard netfabb Material style that is just modified for the raft. Print time for (fully filled) bolt using a standard pillar raft was about 9 minutes. This style is unsuitable for small tree-like structures (Eiffel tower, jewelry hand etc.) since it goes too fast. With plastic rolls you can't have both thin layers and snake speed.

Build style

• 2 Walls
• Only one region
• Most elements are printed thin/medium
• Hatching (as always) for upskins and downskins

Material style

• 0.150 layers size
• Default fabbster settings, except for a few things
• Raft was set to be printed a bit slower.

Variants

• Tinman-1: 2 walls
• Tinman-2: 3 walls (better for larger objects with loose fills)

Settings

• You can set fill space to none (depends on the object)
• Adjust temperature to your plastic (I use 265-270)

Directory with build and material style:

• http://tecfa.unige.ch/guides/3dprinting/fabbster/styles/r2d2

Some styles compared

The purpose of this section is not to provide any sort of serious comparison/benchmarking, but rather provide a feeling of what could be different and sometimes why....

Vanessa vs. RD2D

Vanessa only works with artistic hollow objects and Duplos. For example, a Netfabb piece, i.e. a hose retention clip designed by Gizmo, cannot be printed with Vanessa. Legos don't come out nicely either, except for the walls, since these are simple to print.

R2D prints in much more detail and can print technical pieces. It will take at least 50% more time to print. You can see such differences in the capabilities of a style by examining the layers to be be printed in the Toolpath tab. If you see interrupted paths, walls that are too thin, etc. you must switch style. BTW the official "relaxed" Fabbster style could print this too I believe (not tested)

A technical object - Vanessa style

A technical object - RD2D style. The trick parts, i.e. the holes, use 4 walls: two outer and two inner.

A technical object - Left: Vanessa and right: R2D2

For other objects, the difference is less important. R2D2 prints at lesser speed than Vanessa and may lead to better results with Legos (no yet tested).

Lego bottom with Vanessa

Lego bottom with R2D2

R2D2 vs. Relaxed

"Relaxed" is an official build style that is fairly complex and that could print large objects and details. It also will create stiff walls, since it will use half-layers (that is 0.075mm z-spacing). That means a lot of squeeze. Without testing, we can hypothesize that this should produce stiffer walls, but maybe less pretty ones. Interestingly, despite long print time, the relaxed style does compromise with inner elements. You can see that it uses less, i.e. prints with wider filament.

A technical object - Relaxed Build styles

A technical object - R2D2 (bigger layers than Relax, in particular for fine parts

A technical object - Relaxed (much smaller layers than R2D2)

Since R2D2 uses much fatter layers, it will print faster than Relaxed. However, an "artistic" object should look as good. You will see the layers, but these should appear neatly.

Vanessa vs. R2D2 vs. Relaxed

The small Lego sized woman for which the Vanessa style fits well (except for the very small parts for now) also could be printed with the R2D2 and the Relaxed styles. Using little filling (around 5mm), the estimated print time for Relaxed is 2h22 as opposed to 40 minutes for the Vanessa style. With a solid fill, Relaxed would take about 3h20m.

Relaxed creates over 1000 layers and the contours are built with 5 walls. Vanessa uses about 600 layers and contours are built with 2 walls. R2D2 is like Vanessa, but more precise and it will take some extra time.

A technical object - Relaxed Build style. It is so dense that I can't even visualize the layers :)

A less technical object (leg)- Vanessa Build style. Less fat, less walls.

A less technical object (leg) - R2D2 Build style. Less fat, four walls, also more details for the very small parts

R2D2 vs. Tinman

Tinman prints faster with smaller (0.15mm) layers and R2D2 prints slower with larger (0.25) layers. It also has more walls. For that kind of objects, Tinman provides better results, since the outside and the winding inside is trickier to print.

Nut - Tinman style

Nut - RD2D style

Outlook

I should take the design idea from the official relaxed style and create a fast 0.25mm layer style that combines all of Angelina, Vanessa, R2D2 and more. Uma is simple attempt into this direction.

I also may go down to 0.2mm and then also play with double layers (0.4mm) for easier sections.

Reusable PLA styles definitions

Since I don't have "modern" easy PLA, you may take my tips with a grain of salt. The PLA I am using was bought from BFB in december 2009. This PLA is very hard and brittle and probably quite difficult as compared to "modern" 1.75mm PLA used in more recent printers.

Getting the plastic to come out

First completed PLA print (to the right)

Read this carefully.

Limitations

• You just can't print with PLA rolls the usual way since the extruder is not made for PLA printing. (The rectangular tube above the hotend is fatally bad for this kind of plastic, and IMHO not great for ABS printing with rolls.
• Anyhow, in order to avoid clogging, you must have throughput ! That means RPM. Else the plastic will weaken above the printhead (in the rectangular tube) and nothing will come after that. That will limit the kind of object you can print as well as quality.

Configuration issues

• For objects that have a flat bottom, don't use a raft, do not print the usual 5 dots ! No anything before the real print. Select a print area on the bed that is very close, i.e. one sheet of paper (the hot end must not touch either !)
• Create a strong traditional raft (about 50RPM) for stuff like DUPLOS. For other objects you will have difficulty taking it off (though you can with mechanical tools like a file).
• RPM must be medium high. Minimum = at least 36 RPM or so, but 50 is better. You might go lower with yours or you may have to go higher. This is easy to test: Just extrude filament for a minute or longer and see if it flows ok. Then, while it flows, reduce RPM to 4 (if you can) and put 50 RPM back. This is to simulate jumps.
• PLA should never stop coming out. Do not use any anti-stringing. On the contrary, have some slight flow while traveling.
• Use a high fill. Since there is no fan, low filling patterns will just "flow/melt" downwards.
• Cheat in the calibration. Basically, don't hesitate to double or triple the default RPM for starters.

Just before printing issues

• Print head must be really close to the print bed. E.g. A sheet of paper between hot end and the bed in the print area.
• Strategy A (difficult) : Insert the filament before sending off the print file. Then, while it is heating pull it half way at high speed. However, make dead sure that you stop that before it can reach the hot end. I.e. put a marker after 6.5cm on the filament. Then, as below:
• Strategy B (certainly works better with a raft):
  • Don't insert the filament as above, keep it above the wheels while it is heating.
  • Let it heat to about 170 Degrees, keep one hand on the filament and the other on the mouse, then act very fast ...
  • Drag the RPM slider in the USB control panel to 240 (high speed) and help with pushing the filament down, but gently. You must be done before it starts printing ! Also keep a flat knife nearby and remove quickly any mess that may have come out. If you can't try pushing it down.... anything.

After printing

• Let the object cool a little bit before removing it. PLA is weak at low temperatures. However, it you printed an object with a flat bottom, then remove it with a knife or something right after
• Take the plastic filament out. Temperature to 210 or so, then reverse extrude and pull. If you leave the plug, it never will heat enough and can't be pushed down in your next round ... The typical fabbster "plug" is deadly with PLA.

Yes, PLA styles will have animal names :)

Hog style

The car above was printed in some hog-0 version I lost because I found the upskins, downskins and filling too thin. This version started printing out a DUPLO but then stopped. Needs to be revised, but may be a good start for others who prefer printing with PLA. You may try higher speeds (but then keep the same high RPM in the calibratation. E.g. instead of medium/snake, use medium/slow at 40 RPM.

This style is called hog because you only can print very simple objects in a coarse resolution. Also, it will print very fat. Flat cubic objects or even parts of objects will simply not work.

Important tricks

• Use a strong traditional raft (as defined in the hog-2 or more recent Material style)
• Lower the object. Since PLA is flatter you have to cheat ! e.g. Try to put the model at z = 0.2mm or even lower. Negative raft/part definition doesn't seem to work as of June 2012.

Build style hog-2

• 3 walls
• 4 upskins and downskins (in case the first two don't go well)
• Negative fill distance (filling and upskins/downskins bang into the walls)
• width=medium/speed=speed combination, i.e. about 54 RPM at speed = 40mm/s

... this method is more promising, in particular if you lower the z-position of the part to be printed. It prints simple hollow objects ok. Will not work with DUPLOS.

Build style hog-3

• 3 walls
• 4 upskins and downskins (in case the first two don't go well)
• Neutral fill distance (filling and upskins/downskins touch the walls)
• width=medium/speed=speed combination, i.e. about 54 RPM at speed = 40mm/s

Material style (hog-PLA-2)

• No anti-stringing (actually even the opposite)
• 4mm layers
• 197 degrees (on my fabbster I have to cheat a bit, since it won't cool down). The real temperatures is about 205. Check with yours ... Also, different PLA may need different temperature.

Material style (hog-PLA-3)

• No anti-stringing (actually even the opposite)
• 4mm layers
• 197 degrees (on my fabbster I have to cheat a bit, since it won't cool down). The real temperatures is about 205. Check with yours ... Also, different PLA may need different temperature.

To do

• Version one is way to fat, version two is much to fat. You could raise print speed, but do not lower the RPMs !
• Since this version is not yet ok, I'll remove it later. But the directory URL will stay :)

Download

• http://tecfa.unige.ch/guides/3dprinting/fabbster/styles/hog/