That got your attention! No, I’m talking about the knob on my pinhole camera.
I designed and 3D printed the spool adapter and winder for my Pinhole Moments camera. The spool is a standard spool that you get with any 120 film. I designed the winder so there is a force fit that is strong enough to lock into position but easy enough to remove without Hulk-smashing the cardboard pinhole camera upon removal.