Ender 3 dual extruder upgrade
thingiverse
I upgraded my Ender 3 with the TH3D dual extruder board. The board is available for purchase on https://www.th3dstudio.com/product/creality-cr-10-and-cr-10s-dual-extruder-upgrade-board/. I sourced a 2 into 1 hotend from eBay, located at https://www.ebay.com/itm/3D-Printer-E3D-V6-Dual-Extrusion-Cyclops-2-into-1-12V-24V-0-4mm-1-75mm-with-Fan/232726487201?hash=item362f9460a1:m:mnsO7MJdse2d2s6bOy5I9CA. Next, I designed a mount for both extruders and made it available on https://www.thingiverse.com/thing:3559787. A spacer was also designed to attach the new hotend to the Ender 3 bracket.
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