Create Recycling Symbols for pretty much every plastic on Wikipedia. These symbols (.stl) can then be imported to any slicer like PrusaSlicer, Cura and so on.

The original file Recycling_Symbols.scad is based on the file from appropedia.org¹.

1. Add part
2. add "negative volume" modifier and choose your symbol
3. mirror if necessery, place and/or scale symbol

Feel free to PR more symbols.

You'll need Python, SolidPython and OpenSCAD. See notes in Recycling_Symbols.py. Then you just run Recycling_Symbols.py and wait for the symbols to be created.

It will create a STL file for each line in codelist.txt. It will create 140 STL files, at time of writing this.

To get a list of all possible arguments, type Recycling_Symbols.py -h.

• --path-openscad lets you define your own path to the OpenSCAD.com file.
• --codelist lets you define your own file with symbols to be created.
• --symbol lets you define just one single symbol (list won't be used). Example: --symbol 92 PLA 1 will create the symbol for PLA, number 99 within the recycling arrows.
• -m if argument is passed, the symbols will be mirrored (so you won't have to do that manually in your slicer software).
• --font-quality sets the resolution of the font. Rounded fonts need around 35 wheras a square font only needs 5.

--path-openscad PATH_OPENSCAD
                      Path to OpenSCAD.com (Default: h:\apps\PortableApps\OpenSCAD\openscad.com)
--codelist CODELIST   File with all the codes listed. (Default: codelist.txt)
--symbol code description symbol
                      Outputs single symbol, if defined. Mirrored if -m is passed. 
                      Code: plastic code (92 for PLA).
                      Description: PLA. 
                      Symbol: 1
-m                    Outputs the symbols mirrored if argument is passed. (Default: False)
--font-quality FONT_QUALITY
                        Quality (or poly count) for the font. Only rounded fonts need high poly count. (Default: 35)

I've tested the script with "Helvetica Rounded", since this font prints really well. If you want to use your font, just copy the font file to c:\users\<user>\.fonts (create folder if necessary). Download Font: https://www.maisfontes.com/helvetica-rounded-lt-std-bold.font

Any other installed font can be used. In Windows, copy your font files to c:\Users\<user>\.fonts\ (create folder if necessary) and restart OpenSCAD. To get a list of installed fonts in OpenSCAD, go to Help -> Font list.

• Symbol 2 does not properly work. I don't even know what it should look like. Any ideas are appreciated.
• Command argument for font quality. Rounded font needs a higher resolution.