I got the 5mm and 10mm 3D-printed spacers. Worked exactly as intended. Screw pass-thru holes are adequately sized for M5 screws and the spacers are plenty strong for the strength of my wheelbase (Simagic Alpha Mini). Really useful in my custom build to get the right spacing for the quick release and shifters.
Works and fits...no complaints
The fit and finish of the spacer was excellent. I wanted to lower my PC monitor as much as possible between my steering wheel and direct drive motor. This spacer provides the gap to lower the monitor into while still keeping the whole steering shaft assembly quite stiff and rigid.