Belt Tension Gauge

by ianjohnson, published

Belt Tension Gauge by ianjohnson Dec 23, 2012
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Checking the tension of the left and right Y belts to make sure they are equal can be a little subjective and uncertain. Use this to verify that they are the same, and have an objective reference for tension.


Load it up with quarters ($4.25) and hang it from the center of the upper belt. Count the number of notches (1mm thick, spaced 1mm apart) between the belts.

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How many grams should be within this piece?

It doesn't really matter. It's more for making sure the tension is the same for both belts rather than setting a particular amount of tension.

what should the tension be? How many notches?

What should the tension be?

I intend to remix this thing to not have the face plate that needs to be cut out.
I am using OpenSCAD and Slicer

Just a note for any Australians - if you scale this print up 17.5% (making it 1.175 in Repetier-Host for example) it will be a perfect fit for Australian $0.50 coins. They more or less 'click' in and on my printed copy don't come out very easily. I used about 10 coins and it gave it a good weight.

What should the tension be? I see your at about notch 4. Is that about what it should be? Is it possible to over or under tighten? If so, how will I know?

I had the same bug in slic3r 97 but printed it anyway and filed out the little wall. My quarters fit snug and perfect, no worry of them falling out. Nice little tool!

For some reason, when oriented open side down and with the toothed neck pointing toward +y, slic3r creates a solid layer where the opening for the quarters should have been on layers 1, 4, 6, and 7 only.

Rotating the part 90 degrees on the Z axis seems to have fixed it, but I figured I'd mention it on the offchance that it's not just a slicing quirk but is actually some weird problem with the part that you might know how to fix.

Is that Slic3r 097? I've seen it throw in random layers on other models that were hollow and open on the bottom. It will probably work in 093, Skeinforge or KISSlicer.

Ah, yep, it's 097. What a strange bug.