J head nozzle 0.4/1.75

The Hot End includes PTFE tubing for both 1.75mm and 3mm filaments. You can switch between the two filaments as simples as inserting the 1.75mm PTFE tubing. Please see the pictures on how to mount the 1.75mm PTFE inner tube.

This hot-end is a combination of ideas from other nozzle designs combined with a goal to reduce the number of custom machined parts to a bare minimum. The J-Head Mk-IV has been proven to print reliably with both ABS and PLA. (PLA will require a small fan to provide air-flow through the cooling vents milled in the sides of the nozzle holder.)

This hot-end easily interfaces with the most popular RepRap extruders, including Wade's Extuder, Greg Frost's Hinged Accessible Extruder, etc.

• Internally, the filament path is identical to that of an already proven design.
• The design is simple as the number of custom machined parts is kept to a minimum.
• If necessary, the PTFE liner can be replaced by using an off-the-shelf piece of PTFE tubing.
• The PTFE is not stressed nor used to provide support. This reduces a point of failure that is part of other designs.
• A resistor is used as a heater. There is no need to wrap nichrome wire or to bake a heater core.
• Heat transmission is improved as there is no thermal junction where a separate heater screws onto the nozzle.
• The weight is very low, making it possible to print very fast.

• Fully assembled J-Head MK-IV Hot-End
• PTFE tubing for 3mm filament
• Ekstra PTFE tubing for 1.75mm filament
• 12/40W heater cartridge
• Thermistor 100k, mounted with thermal paste.
• Hollow-lock socket set screw
• PTFE insulation for thermistor
• 20 AWG high temperature wire