This is based off the latest 0.4 Beefy lulzbot Idler variant (which compared to 1.4c is basically 2.0 anyways), licensing is Creative Commons Open Source Attribution as usual. Please feel free to use this part in any manner you see fit. If I can save one person from the agony of a stripped idler arm nut socket, then it will all be worth it. If you are retrofiting an existing extruder, you will want the beefy style idler latch as well here: http://download.lulzbot.com/Mini/1.04/production_parts/printed_parts/beefy_idler_latch/
Instructions: insert one M3 heat set insert (http://www.mcmaster.com/#94180a331/=13ettuz) into the hole in the side of the idler. Then install it using the stock mounting hardware and bearing insert thingy in the stock locations.
This will fit any of the Lulzbot extruders, for all the AO-10x variants, the Taz variants 1-6, and the Lulzbot Mini. it should also fit most other Greg/Wade style extruders
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