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No corresponding source for the parts is available? I don't seen an MK4 branch in there, unless they ditched openscad entirely (even then at least STEP files should be provided if it's still Open Hardware).
Back when Prusa-the-person designed the original i3 I'm pretty sure there were no other Free Software CAD tools than openscad. I don't think it's a huge loss if they abandon openscad (as long as STEP files are provided) since the source for the i3 was uhhh... not exactly the paragon of openscad design (magic numbers, magic numbers everywhere). There's a variant which is parametric but hasn't seen any updates since before the MK2. My reprap is based on some bastardization of the Wilson reprap and my own custom 10mm variant of the old community i3 repo, but I managed to make it even worse because I was looking at the z-axis parts upside down and completely hosed the coordinate system and other fun things (the joys of hacking on a large blob of mediocre openscad while also not knowing anything yourself about cad...) and then I got busy and I'm so distant from it now I can never get myself to go back in and fix it.
If you're looking for examples of high quality openscad code, dotSCAD is pretty cool. nophead (old school reprap person and one of the openscad developers) has a parts library that I think is high quality.
If you're looking for examples of high quality openscad code, dotSCAD is pretty cool. nophead (old school reprap person and one of the openscad developers) has a parts library that I think is high quality.