Here is newly designed, low cost metal hotend - MB PLUS, it has PTFE lined stainless barrel that allows trouble free, low friction filament flow. This hotend designed for 1.75mm filament only. Standard nozzle orifice diameter is 0.4mm. Hotend is compatible with many different makerbot-like china-made nozzles from Flashforge, CTC, Mbot3d and other brands. This gives good selection of nozzle orifice diameters.
Standard mounting option: J-Head compatible groove mount.
Assembly of this device is straight forward. Please consult with supplied drawings and pictures for visual clues. Suggested way of thermistor mounting: JB Weld steel epoxy or kapton tape.
Thing uses 30x30x10mm fan and 3d printed fan duct, to provide adequate cooling during operation. Do not use without fan working.
This design composed of parts originated from makerbot MK7 stepstruder and also some custom designed parts. Please check out download section for drawings of parts and assembly.
Complete MB Plus kit (no fan-duct included) sold here:
Please see supplied dimensional drawings for complete information on the thing parts. You can use many different nozzles from Flashforge or other similar brands.