Geeetech A20 Retrofit to XCR3D 3-in 1-out Non-mixing Hotend

thingiverse

This is a retrofit for a Geeetech A10 / A20 to incorporate the 3 in / 1 out non-mixing hotend by XCR3D (https://www.aliexpress.com/item/4000418707950.html?spm=a2g0s.9042311.0.0.3cdf4c4dKa0v4B). The design allows for removal of the small stock cooling fan and replacement with two 40mm x 20mm fans, for a 50mmx15mm part cooling blower, for the BL Touch distance sensor, as well as incorporating a mount for the Geeetech jumper board. I used M3 screws from a kit I have like this one: https://smile.amazon.com/Stainless-Assortment-Precise-Beautiful-Printed/dp/B0714FLXND/ref=sr_1_1_sspa?dchild=1&keywords=m3+screws&qid=1609559715&sr=8-1-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEzQjdLTTY4QUlaVUlFJmVuY3J5cHRlZElkPUEwMjA5MTc5M1FGNlhQNlFIR1Q2TSZlbmNyeXB0ZWRBZElkPUEwNzA2NDg1MUJDMkNRV0dNWkVZMyZ3aWRnZXROYW1lPXNwX2F0ZiZhY3Rpb249Y2xpY2tSZWRpcmVjdCZkb05vdExvZ0NsaWNrPXRydWU= I suggest using M3 locknuts like these: https://smile.amazon.com/100Pcs-Stainless-Self-Lock-Inserted-Clinching/dp/B075ZZW7VL/ref=sr_1_3?dchild=1&keywords=m3+locknuts&qid=1609559776&sr=8-3. The printed parts are designed to allow the nuts to be press-fit into the recesses to make it easier to assemble. I designed several elements for wire management... one before I printed my setup, and one after. On the rear of the mount, there are two channels for the hotend heater and thermocouple wires. I reversed the orientation of one of them so the wires travel in opposite channels. On the top I later added a couple of loops to which the wires can be zip-tied, though I didnt get those features into my parts. I'm installing this onto a A20M chassis, but I have plans to add a 3rd extruder so I can use all 3 inputs. For now, I'm using 2. I'm working on tuning the extraction and purge code, and will try to amend those when I feel I have it worked out. Thanks to Lee Dunkeson for his feedback on retrofits to make this work with his A30T. Use the "Mount 2 fans A30T" part and "fan duct - touch sensor raised 2.5mm" and Lee's "Breakout Board Mount A30T" stl files instead.