this is printing nicely so far, yay!
Oh, you’re printing the K-1 from E-Nable?
What version is this? The gauntlet looks unfamiliar.
@Xenomorpheus @Adam_Steinmark It is the K1 Hand off of Thingiverse, not sure the version if there is a latest please direct me to those files. This one has issues I had to remodel the wrist hinge pins as the STL from thingiverse the base flange that holds them in place is narrower than .4mm and will no slice into a tool path.
Not seeing it on Thingiverse but found it here: https://3dprint.nih.gov/discover/3DPX-001705
@Adam_Steinmark I could have sworn I got it off Thingiverse but I think now you are right I got it from that URL through the Enable group. I went around and DL’ed many prosthetics that day, got confused 
I am going to design a prosthetic, the hinges all need to be tabs printed flat so the loops are aligned best for strength. The finger base tabs on the palm part are vertical making layer bonding the only thing resisting torque and extension strain on the hinge. Slots in the palm and flat printed tabs would be better. Might pull out, at more force than the layers will come apart, but then it would be replaceable.
If you can, instead of 3D piinting pins for the knuckles and wrist, I find using metal rods (like brass) are a lot better and more durable. I can get 1/8" dia, 3’ rods from Lowe’s Home Improvement for about $1/ft.
@Xenomorpheus interesting thanks. I have a few different diameters of brass and aluminum tubing, 1/8 through 1/4 so I will try it out. I have a bit of random hardware around as well, lightweight but strong chainring bolts come to mind. short ones might work really well.
Just a heads up, you can still make pins, but design them to hold the metal rods. Helps distribute the strength of the metal across the plastic and reduce fracturing.
Working on designing a prosthetic hand myself, but specialized for an individual. It uses flexible and rigid parts. I use toy car pins for the finger joints, saves space.
@Xenomorpheus and @Adam_Steinmark OK the fingers, the pins to attach them, the knuckle finger hinge tabs built into the palm part, it’s all really bad for the end user.
Issues with strength of layer adhesion building vertical small hinge tabs. Too many failure points on one long print.
Just because you can, does not mean you should. In this case making large parts with small attachment points integrated is bad.
To my industrial design mindset this is a model of a potential prosthetic. The hinges that take all lateral load from finger to palm part need to be separate, built in horizontal loops. They will break it needs to not require reprinting the entire palm to replace them.
Not criticizing the designer it’s a good step but it’s not the prosthetic that people actually need. It needs major refining for tighter tolerances, less toylike hinges that are replaceable, thought for where it will break when the fingers catch on something, and design to make that easy to fix by a child, user serviceability.
This hand was mainly designed for look, form over function, not repeated heavy lifting. And believe it or not, if made from ABS, it’s actually quite durable, and even moreso when acetone polished ABS (fusing the outer layers).
The only part I have an issue with are the 3D printed pins for the joins, as I don’t really trust those. I recommend using brass rods, and you can made coverings for them that would distribute the strength of the metal more evenly. While I am no expert, I am designing one meant for heavy lifting and whatnot and have had some success with my own variations.
@Xenomorpheus how about PETG? that is what I printed it in. I print at home in a small studio apartment so I do not print ABS at all, too many vapors, gives me a headache. I have Nylon as well, which would be better? Is there an issue donating in other than ABS? sorry for all the questions, I will ask the enable community as well.
Nylon would likely be the strongest, only because I’m not too aware of PETGs properties . . . but Nylon also runs about $50-100/spool, so that makes it that much more expensive.
You should be able to ask for any material I think, but I’m not too sure.
And don’t worry, questions are welcome and help improve what it is you’re trying to do.