LEGO Retaining Collar 3D printed for Axles; TPU Filament 

I will put the .stl file for this collar on Thingiverse when I learn how to do it. I do not have an upload account yet. It is an .stl file of an 8 tooth LEGO Technic gear that has a cylinder added to the outside over the teeth. The X hub is reduced slightly and the collar is printed in TPU on our Weedo Tina 2 3D printer so that it fits tightly on any axle as a retainer. TPU is a flexible filament and does work on the Tina2.