Using Inkscape for laser cutting
Introduction
Inkscape is a popular tool within creative commons/opensource communities, e.g. fab labs and for several reasons:
- The drawing tool is decent enough
- It supports the popular SVG format (and uses an extended version for itself). This allows publishing drawings directly on an HTML5 page. In addition, there are nice repositories for drawings, e.g. http://clipart.org or the https://thenounproject.com.
- There are interesting extensions and probably, over time, there will be more.
Using Inkscape with Trotec laser cutters
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Using fonts
Fonts for cutting
It probably is best to convert fonts to paths, add stroke and remove fill.
Fonts for engraving
Globally speaking, a font used for engraving:
- should neither be too thin (details being lost) or too fat (too much materials to remove)
- should not be too cramped (e.g. like TimesRoman). There should be some space between letters.
The Hershey text Inkscape extension includes fonts that are nice for engraving, i.e. so-called stroke-based fonts.
- EggBot extension download
Resources
There are commercial specialized websites that provide fonts suitable for cutting and engraving.
- Onlinefonts.com
- Fontspace.com has free engraving fonts.
Image processing
I'd have to see the Trotec Control software which does have some built-in image processing facility.
Importing
- Import the picture
- Object->Transform->Scale
Greyscale and contrasts
- Transform to Greyscale (the laser only has 1 color, i.e. depth): Filters -> Color -> GreyScale
- Play with contrast and brightness to make the picture more "black and white" and still preserve details you want to engrave: Filters -> Color -> Lightness Contrast
Aggregate
- Aggregate pixels to larger surfaces. You can use various filters for that (optional)
- Raytrace the whole thing, i.e. translate pixels to vectors. (optional): Path -> Trace Bitmap
- I suggest (for now) playing with brightness cutoff, e.g. select 0.2 to take away greys, also
List of extensions
First, learn how to install extensions, e.g. Ubuntu, read How to install inkscape extension in Ubuntu. Basically, you have to find the extension directory and then copy two files.
Some extensions may not work, either because they were not tested on your operation system or because they are not compatible with your inkscape version.
JigSaw Extension
Read and Download
Test under Ubuntu 16 LTS
- This works, under the condition to copy manually the contents of the *.py and *.inx files from Github. Click to open, then "raw", then copy/paste.
- The puzzle may to too small to see when you try it first time, since the lines are very faint. Make it bigger.