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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.
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.
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.
Ultimaker Adjustable Belt Tensioner by mattheus is licensed under the Creative Commons - Attribution - Share Alike license.
So what's this mean?
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