Short version and FAQ:
This is an adaptor for the Minolta MC/MD lenses so they can fit into Canon EOS DSLR cameras. The idea was to take into account the flange focal length but in practice it's a little more complicated.

Q: Does it work?
A: kinda, it depends on how you print it. Statistically I'd say no but for some people the final measurements were usable.

Q: Can you post the original file for me to modify?
A: As much as I'd like to I lost the original file and I don't have time to rebuild it so no.

Q: Will there be any more updates?
A: I'd hate to say no but don't count not on it. As I said, I don't have the file and I don't have the time, sadly.

Given the experimental nature of the piece it should have been version 0.1 instead of Mk something. Feel free to use it as a starting point but don't expect it to work perfectly or you will be disappointed. That said, thanks to everyone who commented, downloaded and tested the model, I hope you get some use out of it.

Now the long version:
This was my first (and so far only) 3d object project.
The outer measurements were taken from the mount of an EF-S 18-55 mm with a cheap plastic vernier so it's not what you'd call precise. The inner part is based on a Minolta MD 50mm prime f 1.4 using the same method.
I was able to make it work on ABS; The first version was too small overall and the second one worked (a bit tight). I don't have further details because I don't have a printer, I had to send it to an internet cafe that offers 3d prints. They costed around 70 mxn (around 4 usd back then)
It was tested on a t2i and a t3 and works ok(ish): produces nice pictures but can't focus beyond 120 cm so it makes the 50mm a nice macro and close up portrait lens. I can't remember if I tested it on the 5D MKII (EF mount) but I no longer have that camera :(
Note that to make any Minolta lens work 100% in a Canon DSLR you'd have to use a lathe to remove 2-3 mm of the outer ring of the Minolta lens to equalize the flange focal length to the Canon DSLR's.
My non solicited advise is: If you have a stock of old Minolta lenses (or one that you really love) and you want to bring them into the digital age save yourself some trouble and get a mirrorless camera with a shorter flange (and lots of commercially available solutions). On the other hand if you love to experiment and learn then fire up the printer and sander.