Pick a size and press Add for each motor size to test on one plate. Wall and offset are Rocket Builder's Body inputs: with the motor they set the tube bore and the joint lengths.
One socket per size. Separate several with commas, e.g. 13, 18, 24.
A shorter peg feels looser at the same clearance. Give two or three lengths to test that too.
Sharp inside corners print tight; the peg's corners follow the socket's, offset by the clearance.
45°. Takes off the elephant foot when the peg prints that end down, and gives a lead-in.