About this 3D model

I made this crank with a separated knob for the Z rod of the Ender 3. The inner diameter is 8mm, so it can be used also on other printers with the same rod. The knob is not one piece with the crank so it's much confortable to old the knob while raising the Z axis. It uses a 3x10mm screw to attach the knob to the crank. I made it like this so it's easier to print.