Base for making custom lamp shade diffuser.
This is the part that gets held against the fixture ring by a nut in many styles of mounted lamps.
Design your own diffuser using the 3.5" center diameter for mounting onto, or use the one provided.

Need one print of lamp ring and diffuser per bulb you need to cover. Designed to print with little to no support, dependent on how comfortable you are with your material. Definitely make sure you don't use an incandescent bulb with this. Any sort of translucent material is ideal for the diffuser. The base can be whatever material you want, but if you plan to bond them together with friction welding or a 3d pen you definitely need to use at least the same base material type.