Mike's Hot End

thingiverse

The original hot end design was altered to include a teflon liner, with most of the design borrowed from other successful hot ends. Designed for use with a bowden setup and water-cooled block, it could also work with an air-cooled non-bowden setup. The only required tool is a metal lathe (even a mini one will do), while goals include reliability, ease of construction, serviceability, and minimal special tools. Materials needed are brass or aluminum 3/8-24 nuts, stainless steel and brass rod from McMasterCarr, aluminum bar stock, machinable plastic, a tubing fitting, and teflon stock material from Digikey. Power resistors and thermisters are also necessary. Tools include a metal lathe, center, drill bits, a sharp tipped bit, and a 1/8" NPT tap. A 1/4" end mill is optional for nozzle machining. Steps involve machining the nozzle, barrel, heater block, and a bowden adapter. The teflon liner is also modified to fit snugly between the nozzle and barrier. To assemble, wrap thermister and power resistor leads with kapton tape before assembly, thread the barrel into the heater block, then tighten using the nozzle. A tapered brass nut can be added near the nozzle tip for an optional finishing touch. Be cautious not to let thermister or heater wires touch to avoid frying a mega A-D converter!