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Ultimaker Adjustable Belt Tensioner

by mattheus, published

Ultimaker Adjustable Belt Tensioner by mattheus Nov 23, 2012
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Summary

There is common problem with Ultimaker that belts for X-Y axises are not tight enough. There are many belt tensioners already here, but they all static (there is no way to change force of tension). So I designed and uploaded one that can use standard Ultimaker's bolts 5x16 and nuts, easy to install and presicely control tension force.

Instructions

Print two parts named 'Frame' and 'Slider'. Take two bolts 5x16 and two nuts that remains from Ultimaker assembly and install them through holes in 'Frame' part. There are two hollows in 'Slider' detail for bolts also. Assemble and install as on images. Use screwdriver to presicely adjust force of tension for belts.
IMPORTANT:
a) Install tensioner on belt with chink looking inside Ultimaker, to prevent jamming with printing head holding blocks on sides.
b) Because tensioner is high enough, do not use it on side where Z-axis located, as it can be hampered by moving bad for printed objects.

Look on images for more info.

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So you tension the belts by pushing the screws against the belts? This will decrease the life span of your belts I assume.

pst: those nuts and bolts are metric, M3 mostly save for some grub screw.
I like that you can set the tension with one screw, but as Yvo mentioned, it is rather bulky and awkward to have opposite the slider. next one is slider mountable?

check this one..  adjustable and  its less bulky, hides very good.
http://www.thingiverse.com/thing:32044http://www.thingiverse.com/thi...

Ultimaker Belt Tensioner
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