Champ S+ Propeller Adapter

This is a 3D printed version of the E-flite Prop Adapter (EFLU4067) for the UMX Beast, Champ S+, F4F Wildcat, and Waco.

It allows you to mount the propeller without the spinner, too.

It is a "some assembly required" design.
There are three 3D printed parts:
1. The main part of the adapter that attaches to the motor.
2. The retainer that keeps the propeller on the shaft.
3. An insert that fits inside the stainless-steel propeller shaft for the retainer-screw to thread into.

There are two non-3D printed parts needed:
1. A 11.5mm long section of stainless-steel tubing with an OD of 4mm and an ID of 3mm. One end of the tube has to have a clean, smooth opening that the motor shaft can fit into, but the other end can be just as the tubing cutter left it. I used a sanding disk to remove the tiny bit of "flash" fro the tubing cutter, and then a wire wheel to smooth all the burrs and rough edges..
2. A 1.2mm screw

Printing:
1. The insert is the pickiest part to print. I foun