Prusa MK2.5-3 Mosquito Hotend Extruder

thingiverse

New version for MK2.5s and MK3s available now: https://www.thingiverse.com/thing:3515782\r\n\r\nNew parts (01/17/2019) and instructions (01/25/2019) are here!!! To make this universal for MK2.5/MK3, and especially the MMU2 upgrade, I've changed how the Mosquito is mounted and the PTFE filament tube is installed to eliminate any gaps.\r\n\r\nThis update improves on previous version: https://www.thingiverse.com/thing:2995464\r\nI used Prusa's new 'Dyson' extruder parts for part cooling, adjusting the fan mount points by 4mm to fit heatblock differences.\r\n\r\nDaily testing ensures no warping of the fan nozzle occurs. I'm using a supplied ABS part on my MK3 and a self-printed PETG version on my MK2.5. There's a 3mm clearance on either side of the heatblock, hopefully enough :-)\r\n\r\nThis thing replaces the stock E3Dv6 hotend on a stock Prusa MK2.5 or MK3 with Slice Engineering’s Mosquito hotend.This installation uses existing mounts and 3mm hardware found on the Prusa. You'll need to provide a short (approximately 40mm) piece of PTFE tubing for completion.\r\n\r\nPETG - 0.2 mm layer - 20% Infill\r\nI utilized the Prusa MMU2 to get 'HOT' and logo emphasis on the cover. If you lack multi-color ability, simply ignore that part and it will just give indented text.\r\n\r\nVideo of installed hotend: https://youtu.be/7WW0kKhmTQ0\r\n\r\n- It's highly recommended to use a new thermistor and heater cartridge. Existing ones in the E3Dv6 hotend have been bent 90 degrees and lay alongside the heat block, making them brittle over time. The Mosquito has cables coming out straight as manufactured and do not touch or run along the heat block.\r\n- In the 'old' design, PTFE tube was kept in position merely by friction. It could shift, especially when I tested with MMU2. The new design is two-piece. Upper PTFE is set against an internal beveled collar in the extruder body. Lower PTFE is set against the indent in the top of the Mosquito hotend. Bevel the tube to securely fit into the Mosquito indent in the pictures. Both tubes are pressed firmly in and then cut flush. Check your filament path at each step for any snags. Openscad source files are included if you need to adjust dimensions for material/printer discrepancies.\r\n- You must 'punch out' the membrane in the Mosquito mounting holes. They're there just to ensure a smooth overhang.\r\n- DO NOT FORGET to put in the capture nuts, especially for the 45 degree fan mount, BEFORE any assembly. The nozzle and Noctua fan mount screws just thread into the plastic.