Easy Install Thing-O-Matic Universal X & Y Axis Belt Tensioner
by Gossamer, published
You will need to drill one hole for each tensioner. The Y uses a 20mm 3M Bolt and the X uses a 16mm one. The X can be a tight fit for thickness, so I suggest you try your first one on the X, if it's too thick you can still use it on the Y.
If you are looking for something that is more securely fastened down or you have issues with warping/pulling off the bolts, there are 2 other options that should fit the bill.
The first alternative uses countersunk bolts and was created by Tunell: thingiverse.com/thing:11775/
The second is the derivative of this one by M_G that adds a layer of plastic under bolt: thingiverse.com/thing:14098
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huh... or design an endcap that doubles first as drill guide, then as a load spreading washer. Then you wouldn't have to uninstall it.
I printed one of these and managed to get a hole sort of in the right spot. I just had an idea in my head that it would be cool to have a drilling guide that you could bolt on to the end cap holes that would show you the right place to drill the hole. Then you could be really sure where the hole is supposed to go instead of going with trial and error like I did.
Great upgrade part!
After fitting these I was able to increase my max print speed significantly and get rid of occasional "walking" of the y-axis (when a tooth slips over the gear causing your next layer to be off by on tooth length).
I've got new problems now though. The higher speeds are making it hard to print ra
ftless/mouse-ear-less without the bottom layers lifting/peeling and all the previously stable cracks on my acrylic parts are growing...one part has already since shattered. Hopefully too many others are not encountering these new problems.
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Just slip it over the bolts and screw into it.
You'll need to nearly remove the lower bolt from the front rail endcap, I suggest getting it flush with the nut. Slide it in between the front rail and the motor pulley and push it onto the bolts.
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