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Spring-loaded Ultimaker short belt tensioner

by JelleBoomstra, published

Spring-loaded Ultimaker short belt tensioner by JelleBoomstra Apr 27, 2013

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1904Views 293Downloads Found in 3D Printer Parts
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Summary

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?

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Hi Jelle! Actually, I already had uploaded a 4-hole tensioner version for the new independent stepper spacers of the UM (check the first STL preview). Mounting on the outside of the frame makes it probably easier to fine-tune, while moving it inside as you may be better (closer to the belt and the stepper).

Now, if you fully screw the stepper in the end, it probably makes no big difference.
In any case the single hole version is a good idea as I don't know if the spring left enough angular freeplay in my design (not a big constraint I guess).

Also I like the shape of your thing :)

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