Heater Block

UPDATED Design Rev 1.1, Mach 30, 2013. Changes:
1. 6.5mm diam x 1.5mm deep bore for mounting of Makerbot's MK7 & MK8 nozzles.
2. Second 2.5mm diam. thermistor hole on opposite side.
3. Tumbling for nice uniform surface finish.

Heater Cartridge, as a heating element of hot end, became affordable alternative to power resistor.

This design solves the problem of mounting heater cartridge on M6 threaded barrels,
works flawlessly with Makergear hot end, can replace Makerbot stepstruder