This is a model of a single or 16 pieces of those little plastic clips you lose if the first time you take off the key contact boards on:
Korg Polysix, Monopoly, Poly 61, Poly 800
Moog Memory Moog
Oberheim OB-8 (later non-Pratt Read)
Sequential Prophet 600, Six Trak
And others that use the same keyboard assembly.
These are small, so many filament printers may make small imperfections at these dimensions. They may take a little post processing (ie a couple passes with a file or sandpaper) to clean up the edges. You may want to try the orientation different ways depending on your printer's abilities.
The "widened" versions have a widened "T" section opening at the base where the part mounts to the metal subchassis. This is an attempt to compensate width with a printer that is printing too wide or if the plastic settles bigger than anticipated.
The 16 piece file is meant for those who want to send off to a 3D printing service. Its the same price as printing a single piece, so why not make a whole set?! If you are going to use a 3D printing service, I don't recommend Shapeways. Their QC and CS are both a little lacking, and I've received numerous errors from them that other services catch. Try a local shop or go meet your local makerspace.
These are free to print and use, but you may not sell them. Don't be that person.
Due to small size, we printed with 100% infill, but i doubt it matters.