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Spring-loaded Ultimaker short belt tensioner

Mooncactus design on thingiverse only had two holes for the stepper motor(should be four) but two screws on the lug side, over- constraining the screw. 

This design is intended to be mounted on the inside of your UM, between
the casing and the motors. If you have and older type UM with the stack
of plywood as spacers: you only need to remove one plate. If you have
the newer plastic spacers you probably need screws a little longer (2mm)
or you can get by with 2mm less thread in the motors?

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