Recently, I discovered an issue where several printed products with active joints showed signs of loosening, similar to the 13 series small dolls. Do you all feel the same way?What should I do?
Thank you everyone~Have a good day~
Uncle jessy did a video on youtube about loose joints, here is the link
and good luck
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Where things rub against each other, especially with hard plastics, they will tend to abrade each other. There’s roughness from the filament lines that will kind of saw at the other part where they rub.
No good advice, unfortunately.
I have this same issue with my collapsible saber blades. They can get stuck of flung out to hard, but over time they smooth out and the blade actually gets longer as the layers get sanded down.
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This video from 3d printing professor might offer some ideas Youtube
For ball joints I would suggest if feasible splitting them into 2 halves with some slight over sizing and springyness. Printing them in PETG, and if big enough maybe even adding some sort of adjustment capability (like a screw) into the design to cope with long term loss of springyness or joint wear.
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Thank you for your reply. I will go and study.
Good idea,I’ll try to do that.Thx.
I found that it’s not just because of wear and tear. I have a model with joints that I haven’t played with after printing, but I still experience joint looseness, which is frustrating. 
I was trying to think of something viscous you could put in the joints but it might just make it “sag” slowly. Maybe there are joints almost like hip and knee replacement but tiny and intended to be used for posable joints for dolls and such that can be built in? That’s just a guess. Don’t even know if they exist but might for artists and such?