Summary

This is a sturdy mount, that allows to engage a rotary encoder using a big crank. A threaded rod will be the main crankshaft.

Besides these printed parts, you'll need

• a rotary encoder (such as these: https://de.aliexpress.com/item/33041814942.html?spm=a2g0o.order_list.order_list_main.5.78a65c5fnYWLPF)
• some length of M8-threaded rod as the main crankshaft
• 4 M8-nuts to connect the threaded rod to the rotary encoder itself as well as the crank handle (I use 4 because I lock each nut with another one), as well as some more M8-nuts and washers to fix the crankshaft where you want it to be
• 2 ball-bearings to allow the threaded rod to be turned easily.

I designed this part before I knew how exactly it was supposed to be mounted and with little time, so I only printed the absolutely necessary parts (so I didn't use the Sturdier_Mount_Secondballbearing.stl myself), and connected them with wood.

The rotary encoder itself goes into the Rotary_Mount.stl. The threaded rod is connected to the rotary encoder using a locked nut and the Rotary_Nut_Connector.stl. Once they are connected, press-fit a ball-bearing into the Rotary_Mount.stl. Now there's supposed to be some length of rod, to stop as much sideways wiggling as possible, before you should use another ball-bearing, press-fitted into Ballbearing_Mount.stl. At first I thought I needed a coupler like they are used for the z-axis of 3D-Printers, but it works just fine without it. Now the crank-handle itself can be mounted either using a locked nut and the Nut_wood_connectormount.stl - or just something welded to the nut itself, as we used in the end.

Survived as the main crank for an electronic barrel organ for a festival, so it appears to be very sturdy.