About this 3D model
Update Nov 2020: I made a simple knob that fits Spektrum and Taranis radio as well. The files are Tx-Knob-2. The Tx-Knob-2_adj has its scaling settings tweaked in Prusa slicer by just a hair to make a better fit. Two knob models which go over the pots on my JR 8103 radio control transmitter. They help you know the radial location of the pot/dial on the TX while flying.