In addition to what TheYang said, I wanted to note that the spec for 3d printed parts for Voron printers is:

4 walls 5 top/bottom layers 40% infill

These are parts designed for 3d printers, so they have to be pretty good. They recommend ASA or ABS because of the temperatures that the printers get up to. Most plastic parts you're used to are ABS or something like it. Water bottles are PET which is similar to PETG, though of course they're really thin so they're super flimsy that way. Your part wouldn't be flimsy, but the plastic would feel like strong PET. That's not necessarily bad, just different.

Personally, I would recommend trying to find someone locally, and buying them a roll of a filament to print the parts for you. I'd budget $15-30 for each roll, and each roll will print 2.2 lbs of plastic parts, which should be more than enough for your stuff and some failures, and probably leave them some extra for their effort.

I think you can probably find someone who is also excited to see that keyboard come together and wants to be part of the build. And I think trying to print it online is going to be frustrating because there could be little mistakes that make the parts unusable that you won't know to predict because you haven't done it before. Or maybe not. It's a gamble, IMO.