QU-BD MBE Bowden Experiment-1 - ord bot mount by Seadevil

Last crawled date: 3 years, 1 month ago

This (untested) design has 3 printable parts. These can be used to convert a stock qu-bd extruder to use a bowden tube. Note that this is an experiment. I currently do not have any mount for the drive portion, once I get it working I'll work that out.
My goal is to get 2 print heads as close as possible mounted on the ord-bot. I believe I can get them closer by removing the drive motors (thus bowden) At the moment i do not believe I can use the body block from the MBE. Those 6mm tapped holes are probably too close together.
This first draft is intended to help me debug the whole bowden conceptnon-printed parts:
qu-bd MBE extruder kit
Straight Quick Connectors Pneumatic Fittings 4mm x 1/8" PT Male Thread (10 for 7.26 on ebay @ http://www.ebay.com/itm/321061698459
1M PTFE/Teflon Tubing/Pipe OD 4mm ID 2mm Tubing - (1m/$5 on ebay, search "ptfe 2mm 4mm")
1x 624 bearing (ebay 10/$5)
3x M3 screws to mount the drive parts to the stepper motor
M4 screw for bearing. (I printed the lever/bearing hole a little small so I could use a #4 screw)
Spring (I had one in a box, it was the diameter of a pencil, and around 1 inch long. I think I got it in a kit from Home Depot)
update 10/9/14
I have been printing with this setup for over a month. I am using the water cooled hot end from thing:280314 instead of this air cooled one, but I would expect similar results. I consider the bowden setup a success (had to increase the retract compared to a virgin MBE to eliminate stringing.)
At this point I'm more interested in perfecting the water cooled extruder so I'll post further updates there.