This is a SolidWorks Assembly of the Original Prusa i3 MK3 by Prusa Research.
Since the printed parts on the GitHub are only in SCAD and STL format, this limits what you can do with the parts.
Therefore, a few users on the Prusa Forum and I took the SCAD files and converted them to STEP files using FreeCAD. When they were imported, much of the cutting commands were lost, so I had to manually select the bodies and subtract them.
Made in SolidWorks Student Edition 2017-2018

I have also posted the assembly to GitHub and GrabCAD.

I have published this under the same Open-Source Licence as the GitHub licence (GNU-GPL) and I want to give credit where credit is due:

PR Forum members themzlab, dan.d4, martin.m25 for helping convert some of the more difficult files,
Neil Rosenberg from UNC-Asheville Mechatronics for his teaching in SolidWorks while I was in FRC. Also, for providing me with a SolidWorks Assembly of another 3D printer. (which contained the E3D hotend and the Bearings I used)
Josef Prusa and his team at Prusa Research for creating this amazing machine in the first place.

NOTE: if you have a certain format that you need this in, post a comment, and I might be able to add it to the files, if SolidWorks allows!