Oooo... 3D printing, my specialty! I have a Prusa MK2, but I have the "MK2.5" upgrade kit in a box, I just haven't gotten around to upgrading it yet.
While the Prusa is expensive, it's hands down the best FDM printer I've used for the money, and I'd say it's better value than far more expensive competitors like the Lulzbot Taz or the Ultimaker machines, which I use at work. Don't even get me started on MakerBot...
PLA really isn't ideal for high impact environments like posts and such for pinball machines. It's probably fine for various toys and decor out of the line of fire, but for parts that take a beating, I recommend printing with ABS or even better, nylon.
My go-to print material is PETG, which prints just about as easily as PLA, but is far stronger (same plastic as soft drink bottles). However, in printed form, it's relatively brittle, so a more flexible material like ABS or nylon should hold up in a pinball environment a lot better.
If anyone needs something printed or reverse-engineered, I'd be happy to either make you a CAD file, print a part, or both. I use Fusion 360 at home, so I could either sent you the raw Fusion file to mess with later, or just the STL to send to your printer.