prusa_i3_bear_upgrade VS Prusa3

I don't know anything about the Printables link, and only know of the Bear upgrades (just read, nothing further), but isn't it all on Github already? https://github.com/gregsaun/prusa_i3_bear_upgrade

I have a Prusa MK3S, bought as an MK3 in 2018 and then upgraded. And build my own Prusa Bear (https://github.com/gregsaun/prusa_i3_bear_upgrade) which costed me more time getting it to work because I cheaped out on the stepper motors initially. But both printers is fire and forget for me. I print a lot, mostly PLA and PETG, sometimes ABS, without any problems.

If you want more rigidity in the frame, you can also upgrade the frame with a BearPrusa of Gregory Saunier : https://github.com/gregsaun/prusa_i3_bear_upgrade

you could do a Bear upgrade

Checkout the Bear Mod https://github.com/gregsaun/prusa_i3_bear_upgrade/blob/master/README.md

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.

Prusa also contributed actively to rep rap, making improvements on the mendel printer, and improved the printer through a couple iterations until he hit the third iteration(i3), that is the basis of the MK series. Before shipping his own product, he shared the design on GitHub, and plenty of low cost manufacturers picked up on his source and blatantly produced their own i3 printers.

https://github.com/josefprusa/Prusa3 is the repository of the Prusa i3 (without "MK" at that time, but I guess it's MK1 then...). I found https://github.com/josefprusa/Prusa3/blob/master/box_frame/common.tdoc which has some vitamins for the frame; you may look around if you find further *.tdoc files with more parts. Maybe also https://github.com/josefprusa/Prusa3-vanilla . Also, some README mentions a documentation file, but I could not find it quickly - might want to check for yourself if you find more docs there.