Prusa Mendel Y-Axis Belt Tensioner
by tosjduenfs, published
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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!
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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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