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Arcol.hu hotend v4.0.5

Arcol.hu v4.0 hot-end for 3.0mm filament (works also for 1.75mm filament too).

It has been a long time since I announced v3.0.

The new features:

• - Hot-zone is completely metal.
• - high temp extrusion should be possible, like pp, hdpe, plexi, polycarbonate, nylon (hopefully, this will be confirmed within a month)
• - shorter, more compact, a comparison photo between v3.0 and v4.0:
  
• - easier to assemble
• - reworked nozzle
  
• - laping for wrenches on nozzle, on stainless steel, heatsink
• - built for easy maintenance
• - self cleaning (you can remove the hardened plastic using two wrenches:)
• - built with dual extruder in mind
• - mounting compatibility for the average/stock reprap hotends
• - 100k thermistor (which seems to be a more common preference)

For assembly instructions please read here:
http://wiki.arcol.hu/arcol-hu-hot-end-v4-assembly

Regressions/future adaptations:
Dropped compatibility for Rapman, Makerbot. A new mounting needs to be designed for these machines.
For rapman a 200k thermistor also needs to be sourced to be electrically compatible.