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Great design, work wonders, thanks !

A reminder to everyone using this kind of design, it will make your motor way worse at dissipating heat. The backplate covered means the motor will get hot if given no way to get rid of excess heat. It's bad, damage can go from excessive wear to fire so... A simple solution is to add a heatsink (40x40 aluminium ones are cheap and efficient), glue it with conductive glue.