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Prusa i3 Rod-Mounted X Tensioner

by thinkyhead, published

Prusa i3 Rod-Mounted X Tensioner by thinkyhead Apr 13, 2013

Description

[2014-11-20] Try Prusa i3 Add-On X Tensioner instead!

This is a simple adjustable belt tensioner that mounts on the top rod on the right end of the X gantry.

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Recent Comments

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Yeah I've ended up not buying any real bearings because the plastic ones I made have been surprisingly reliable. Didnt even use any lubrication or anything. I may switch to the design you mentioned simply for the sake of change and keeping things fresh, but thus far I've really had no need to.

Nice! That's a new idea. Should work ok as long as it's nice and round. I've switched to using my "add-on x-tensioner" on my i3 but I'd still use this design on any machine that didn't have an easy way to add a tensioner to the end.

Very nice simple design! I've been using this for awhile now and it's been reliable. Also, I didn't have a 624 bearing when I originally made this, so I designed a 3d printable replacement.

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Instructions

For an adjustable tensioner you need to add a 624 bearing, a 4mm screw, and a 3mm screw to this part. It's designed for mounting on the top rod on the right end of the X gantry. Of course your x axis needs to be set up so the bottom span of the belt attaches to the x carriage. This tensioner will probably work fine inverted on the bottom rod too.

The parametric SCAD file also allows you to print a non-adjustable part at your adjusted tension. A sample non-adjustable one is included in this Thing. You can also adjust other parameters, such as wall thickness, bearing screw size, etc.

Very nice simple design! I've been using this for awhile now and it's been reliable. Also, I didn't have a 624 bearing when I originally made this, so I designed a 3d printable replacement.

Nice! That's a new idea. Should work ok as long as it's nice and round. I've switched to using my "add-on x-tensioner" on my i3 but I'd still use this design on any machine that didn't have an easy way to add a tensioner to the end.

Yeah I've ended up not buying any real bearings because the plastic ones I made have been surprisingly reliable. Didnt even use any lubrication or anything. I may switch to the design you mentioned simply for the sake of change and keeping things fresh, but thus far I've really had no need to.

When I slice this there is a gap where the screw hole is. Any tips?

What slicers have you tried? It seems fine for me using Slic3r 0.9.9.64.

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