Ok, I know... everybody has had their go at a version of the extruder feeder for the Ultimaker 2. I have used a customized version for a while and now there even is the UM2+ version as an upgrade available. So why another one...?

Well I personally like the Bondtech concept a lot where the filament is captured and driven from both sides. It gives less deformation on the filament, thus less friction in the bowden tube and less chance on grinding. Also I think it should be a very good option for flex filaments but I have not tested this personally. One note before you continue to read, although this is my 6th version with many tweaks, this is still a work in progress.

The good thing is that you can print all the parts and only need some cheap (eBay) gears and MR85 ball bearings which will set you back a whopping €10,-

Still interested?

Next to the printed parts you will need the following:

• embedded bowden tube clamp : e.g. http://www.aliexpress.com/item/3D-printer-parts-accessory-1-4-tube-pipe-Embedded-Bowden-Couplings-For-3-00mm-Filament/32216034859.html
• 2x mk8 drive gear 3mm : e.g. http://www.ebay.com/itm/141743511501
• 2x 26 tooth drive gear : e.g. http://www.ebay.com/itm/381448621738
• 3x MR85 ball bearing : e.g. http://www.ebay.com/itm/161808077922
• 6x M3 x 20 hex bolts
• 1x 3mm axle for the lever (27mm long)
• 5mm axle for lever part (32.5mm long)
• 5mm axle for extending the motor axle into the ball bearing (12mm long)
• The original UM2 extruder spring
• a small piece of bowden tube to fit in the lower opening of the base.