Stepper motor heatsink bracket

my Prusa printer's X, Y and extruder motor tends to get hot when printing for a long time, that's normal. however I like things to be cool. so I design this heatsink brackets to snap lock nicely onto the rear of these stepper motors, with a common square 40x12mm heatsink.
(if your stepper motor gets extremely hot and experience shutdowns, then you should first tune the voltage down accordingly)

the STL file comes cutted at 5mm from one surface up. printed in ABS, use acetone to join the par