Yes, 3D printers are really ideal for repairing robots like Pleo where the internals are hidden, because it really doesn't matter that the parts come out looking slightly rough-and-ready compared to plastic items produced with more expensive equipment.

The printed parts are quite strong, too, and it's ridiculously cheap to make small items.
I would be more than happy to produce those parts for people on my side of the world if someone were able to provide the design files. Unfortunately I can't design and try out the parts myself as I have no broken Pleo, but I do have access to a 3D printer or two and will no doubt be printing my own replacement parts that way if something ever did happen to Lizzy or a future Pleo.