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Mooncactus design only had two holes for the stepper motor and two screws on the lug side, over- constraining it.
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?
Spring-loaded Ultimaker short belt tensioner by JelleBoomstra is licensed under the Attribution - Non-Commercial - Share Alike license.
So what's this mean?
We're sure JelleBoomstra would love to see what you've printed - take a photo and share it on Thingiverse as a Make.
To post a Make simply visit this Thing again and click I Made One to start uploading your photo. You can also download the Thingiverse Mobile app (available via Google Play and Apple App Store) to take a photo and upload your Make right from the app!