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This carriage was made to fit the pre-assembled Mk8 dual extruder by Geeetech. You can find this extruder on Geeetech's website as well as eBay and Amazon. It was designed with my HICTOP Prusa i3 with aluminum frame in mind, but I think it should work with most Prusas as long as you're using the metal 8 mm linear bearings. The bearings attach with stock M4x8 Bolts. This print bolts directly to the HICTOP belt holder (http://www.thingiverse.com/thing:1003604) with a pair of M3x16 bolts and M3 nuts.

The fans assembled as shown work pretty well for both extrusion cooling and keeping the heat off the 3D printed parts, however, Ryanrose has made a decent fan mount for this build. Check it out here:
http://www.thingiverse.com/thing:1924231

Update:
After a while with my fans off and the heat on, the front of the carriage started to deform ever so slightly (this is using PLA). I've solved this by wrapping a zip tie around the top-back of the extruders, down the sides and accross the underside of the carriage. This distributes the weight more evenly and alleviates the pressure in the front. (sub-update-11/2/17: this has been working well for me since my original upload; no issues)





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WARNING!!! You may BRICK your control board if flashed incorrectly! I would advise reading up on the process before doing anything. I can't take responsibility for any mishaps.

I've had A LOT of requests for the firmware to accompany this x-carriage, SOOOO...

CHECK THE DOWNLOADS SECTION FOR SUPPLIED FIRMWARE.ZIP FILE

Must use Arduino program 1.0.6 to compile and flash the firmware. Select Arduino Mega 2560 as the board.

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