Prusa Mendel Y-Axis Belt Tensioner

by tosjduenfs, published

Prusa Mendel Y-Axis Belt Tensioner by tosjduenfs Nov 9, 2012
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Spring loaded belt tensioner for Prusa Mendel.


Print two of each part.

The parts were made in SolidWorks so unfortunately I don't have any OpenScad files for them.

All STLs have been loaded into Netfabb and repaired to ensure they are perfectly manifold.

The vitamins you'll need for assembly are a 608zz bearing two extension springs and either an m3x20 screw or a 4-40 0.75" screw. Rather than describing assembly it is probably easiest to just look at the picture. Insert the screw through the base of one of the bearing holder arms and screw them together.

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I printed it and I'm now waiting for my 608zz to come in the mail. It fits my Air-2 nicely. I bought a pair of tension springs at Lowe's that were 1/4" x 1-9/16" Hillmans.

Printed with ABS, and I drilled out the bolt holes in the arms a little. My printer is slack in the Y-axis, so the bolt head and the nut wouldn't fit, because the Y-dimension is a bit short.

I have a few recommendations: (or if you release the SCAD, maybe I could learn to remix?)
1: I'd say that a second arm should fit a M3 nut trap/holder
2: Make the lower hooks one wide hook (for the bar) that has two small protruding hooks on top for the springs.
3: Maybe make the bar-end of the arms clamping instead of snap-on?

I printed out this design as a short term fix for my MG Prusa Mendel. When I installed it, it crushed about 50mm of my y-axis. Had to remove after a couple of prints. However, I will be using a similar concept when I replace my belts with synchromesh cable like I have on my x-axis. Two more parts to design and I'll be all set! :0). Thanks for posting this!

I printed it. came out beautiful.. then proceeded to break 3 sets of arms before scraping the project. :( they are just to brittle in PLA or the holes are to small.

Check that your printer prints the inner diameter of circles accurately. I've never had an issue with the arms breaking and I only use PLA

it seems to print all the circles flawless just when threading the m3 screw in it hits about half way gets tight.. then snaps off

Spring loaded tensioners are up for debate with accelerated moves.
See: http://www.thingiverse.com/thing:23390http://www.thingiverse.com/thi...

Automatic belt tensioner for RepRap Prusa Mendel

I suppose it is possible. I never had any issues when I was using it. However, I've since designed a new printer that uses a fixed belt tensioner, just a screw and ram on one side of the belt where it is held to the carriage.

Great job man! keep printing :)

Thanks, it works very well.

Fab, was going to design one of these at some point :)