A bowden extrusion system for a 6mm tube, based on wades extrusion system, no "special parts" that not anybody could access easily are needed.
Until now I wasn't able to test it in action, but it seems very promising to me
The extruder with its gears is this one: http://www.thingiverse.com/thing:18379 thats why its marked as derivate of it. If Greg, Jonas or anybody else involved in these extruders are not confortable with the fact i uploaded the stl files, please tell me, then i would remove them and give certain instructions to your files. (Cause I highly respect your work)
I scad-ed jonas kuehlings extruder for grrf hotend, with 6mm filament feed hole (for bowden) and 0,4mm layer height. The gears are just combined to one stl file.
place the bowden adapter into the extruder instead of a hotend, and push the bowden through everything, till under the hobbed bolt. Maximise the outside friction, just tu put the tube into the adapter wouldn't be enough to be reliable. Tight = better !
secure the bowden adapter with 2pcs m3 x 30 screws
why is it in 2 parts ?....beacause i don't like ABS. I'm printing PLA only, and I want to avoid a fan next to the hotend. I'm using different PLA materials. The white one has a softening temperature of 90Â°C, but hasn't got high tensile strength qualities, so clamping the bowden tube and thin walls don't work that well. That's what the bowden clamp is for.
Put the bowden clamp into the hotend mount, connect it with 2 m3 x 25mm screws.
Hotend into the hotend holder, secure with 2pcs m3 x 25mm screws. As I have a PTFE Tube, I decieded to drill 6mm into the PEEK holder, so that the PTFE tube goes right through to the brass nozzle, to lower inside friction.
Secure the bowden tube with 2pcs or 4pcs m3 x 20mm screws. (normally 2 are enough, but there is the option the use 4 ;-) )
sorry for being to lazy to place nut-traps, but im a bit short of time atm.
mount everything onto the carriage, with 4pcs m4 x 15mm screws.
Use washers and of course nuts for every screw.
feel free to adapt the hotend mount to your hotend, skp file is upped aswell.
update: now also available for non delte printers, i.e. Prusa