Judging the durability of a 3D printed camera is going to be tricky due to variations in materials, print settings, and print quality - So remember to take comments with a grain of salt.
A copy printed on a professional's print farm with finely tuned machines and carefully tested filament is going to fair a lot better than one printed on my dodgy Ender 3 Pro with its currently wonky Z Axis and extrusion issue... [At some point I should probably just give up and rebuild the whole thing...]
And in cases like the WillTravel, I think concerns about long term durability might be a bit misplaced for someone with a 3D printer - If it does wear or get worn, print replacements with an attempt at improving the design? After all there isn't a great deal of sense in owning and running your own 3D printer if you're not tinkering with it as a hobby compared to ordering printed parts from a professional print service.