I made this thing to install a short tube motor with a size of SW40 to a roller shutter with a octagonal SW60 mount. The adapter is designed to fit in the motor "JM35" from the German brand "JULIUS MAYER". SW40 and SW60 probably are German units - sorry, I don't know the international ones. SW40 = 40mm outside diameter.
The ring is pushed over the motor driver, the wheel is fixed at the end of the tube.
I printed in PLA with medium quality and infill. My shutters are very small and lightweight. Thus, PLA is sufficient here. For larger shutters may better make use of ABS!
Please note, that the original adapters for motors from the brand “Jarolift” looks very similar, but I did not tested compatibility! Other brands looks significantly different.