Additional extruder(s) for the reprap so that we can extruder multi-colour, multi-material (main+support), and flexible materials.
The RepRapPro Prusa Mendel that we have was designed to take upto 3 bowden style extruders, although it requires additional driver boards and components.
In order to accommodate flexible filaments such as NinjaFlex we require a design where the extruder drive is right next upto the nozzel/heater mechanism, as in a bowden system where the filament is pushed down a long tube the filament would buckle and jam.
The estimate above is for just adding one extra extruder. If we get more than our goal or it turns out cheaper than we expect the extra will be used to buy improved versions of the parts on the list and/or to build up our stock of different filament colours/materials.
Total £100 paid out of £105 total pledged towards target £105.