This is a remix of my original found here: http://www.thingiverse.com/thing:239710. That one worked fine but I found that (as always) there were improvements that could be made.

Change log:

• I moved the bowden push fit connector to the back plane to increase range of movement for the lever without adding unneeded bend to the filament, so now there is a cleaner path of travel for the filament with less friction.
• I added a funnel to the top of the bowden connection area to ease filament changes.
• I made the transition area between the funnel and the pushfit connector more tailored to remove any chance of snagging there during filament changes
• I also changed the feed tube on the lever to make it more robust, it was a little thin before
• I recreated the back plane in openscad and made the lever modification in openscad (I didn't feel like recreating the wheel with the lever, just tinkered with it a bit).

As before:
This can be used wherever a direct drive bowden extruder is desired. With hole for push fit connector.

I had problems with all the spring version extruders. Initially they would work but after a few months they would lose compression and start glitching. So I built an extruder loosely based on Joe Chung's remake of Whosawhatsis' minimalist extruder that uses a screw instead of a spring. I still wanted some flex though to allow for the possibility of some filament with low diameter tolerances so I use an M4 screw to apply tension and use about 5-6mm thick piece of rubber cut off from a rubber plug found at the hardware store for $1. In order for the M4 screw not to dig in to the rubber, use an M3 washer between the end of the screw and the rubber.

This is designed to work in conjunction with my mounting bracket for a Cerberus (Rostock style) Printer found here: http://www.thingiverse.com/thing:159478

It could also be mounted directly to an aluminum extrusion with appropriately sized T-Slot nuts.