MendelMax Y End Idler with Belt Tensioning

by DanFineArt, published

MendelMax Y End Idler with Belt Tensioning by DanFineArt Feb 27, 2012
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I wanted to be able to tension my Y belt without having to work underneath the machine, so I decided to try adding a tensioner to the Y end idler. I have this mounted on my MendelMax and it seems to work very well. In fact you have to be careful not to over tighten it.

Edit, March 1, 2012

I fixed the mounts with the ridge by eliminating the ridge around and above the hole.


I designed this part to use the same screws as the rest of the MendelMax. It requires 3 of the M5 20mm screws and 5 of the M5 flat nuts, so if you bought the bags of 100 you have lots of them left over, 2 washers and 2 of the M5 10mm screws for mounting. You will also need parts to install the 2 608 bearings. I used a 2" 5/16 bolt and 2 nuts. This length gave me enough non-threaded section to have the bearings ride on and it allowed me to put on a second locking nut. You could also use a bit of the leftover 8mm rod and just compression fit it in, or you can use some of your leftover 8mm or 5/16 drill rod and some nuts. I designed the idler to fit the 2 bearings and 2 washers between the bearings and the plastic. I designed the mount pieces with a ridge that fits into the slot of the extrusion and that is the version that I printed and am using on my printer, but I don't think that they are necessary, so I posted files of the mounts with and without the ridge.

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I attempted to print this, but at 0.2 layer height, slic3r does not slice the first layer flat. The main body is half on the first layer and half on the second layer and the mounts dont print until the second layer on both of the combined STLs.

The same issue is happening with the All with ridge.stl file.

I must have uploaded the wrong file, I think I got the correct one this time. Try the All with ridge V4 file.

Sorry I thought I had it fixed, I will try again. :-[

I think I have fixed the problem, N00b mistake sorry. :-[

No worries. I'll give them another shot. Love the design btw. :-)

Sorry, I am attempting to diagnose the problem and see what the problem is.

Thank you for your kind words, and the feed back. It is a pleasure to be able to contribute to something that is so great to begin with. It is amazing to have a machine that you can use to upgrade itself.

Awesome solution. I printed the "all with ridge"version, just because... and they came out great - except for the frame mounting hole area where the "ridge" is super thin (see my "I made one!" pic...). Not a structural issue at all, just a few dropped threads requiring a little clean up. Great job!

I like it very much indeed. In fact I will be including this with my kits in the future I believe!

Thanks for the contribution!

brilliant, this one is getting added to my machine