8mm Jag's Yet Another Extruder Filament Drive

by gaerisl, published

8mm Jag's Yet Another Extruder Filament Drive by gaerisl Dec 14, 2011
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This is Jag's "Yet another extrude filament drive", modified to work with a 8mm bearing on the idler arm. (http://www.thingiverse.com/thing:7113)

Use this if you only have one 606 bearing, have access to 8mm bearings, and are in a pinch.

8mm bearings are commonly available on longboards and skateboards. (ID 8mm, OD 22mm, width 7mm).

Nov 20, 2012 update:
If you're having issues with breakage and need stronger parts,
MarcusWolschon has created this buffed-up version: http://www.thingiverse.com/thing:35092


Print, clean up, (may need to clean holes with a drill).
Assemble via Jag's instructions (http://www.thingiverse.com/thing:7113), using the same parts, except substituting a 7mm hex head (or 6mm, if you can't find one with small enough hex heads) screw for the idler arm axle.

Yes, support is also included already for the idler arm.

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looks nice and simple

I guess I'll design a stronger version of the lever-arm today.
My first 2 attempts broke.

 I'm sorry to hear that. I'll follow up with you to best assist you in this problem.

What size bolt are you using on this for mounting the bearing. Length and diameter please. Is it a socket head cap screw?


I used a 6mm hexhead screw of approx 20mm length (22 including head). length doesn't matter much, as excess juts forwards out of the front.

It helps greatly to go with parts in-hand to the local hardware store and rummage amongst the metric screws.

Hope this helps!

So you ran a bolt with about a 2mm od smaller than the id of the bearing?


That is correct; the ID of the bearing is 2mm larger than the OD of the bolt.

Unfortunately, the various heads available on 7mm and 8mm screws are too tall/wide to fit into the assembly (from the selection that I found locally).

However, the mismatch in diameters has not presented me with any problems, The spring tensioner may also help over a static tensioner.

Working fine as-printed on 1.75mm on a Mk6+ hot end stepstruder on my cupcake. The non-adjustable Delrin "spring" on the stock Makerbot cold-end was getting worn, so I was stripping filament. Got this printed just in time, now printing previously difficult prints. Nicely done, great design, and thanks for posting it!

gaerisl - in reply to

Thank you! Glad to hear you like it!

Credit goes to Jag for the original design. I just hacked it to make it fit an 8mm bearing.

This is a nice upgrade of the standard MK6.

No more constant adjusting on that DELRIN/POM adjusting screw :)