OB1.4 Dual E3D extruder

I designed a new carriage and extruder setup for the OB1.4 printer to mount dual extruders on the X carriage. So far it looks like it works quite well.

I am using geared stepper motors to drive the filament. They can be bought here: http://www.robotshop.com/geared-bipolar-stepper-motor-3v-233-oz-in.html

The bowden tubing can be bought here: http://seemecnc.com/collections/parts-accesories/products/ptfe-tubing-2mm-id-x-4mm-od

The hobbed filament drive can be found here: http://trinitylabs.com/products/hobbed-pulley

the tubing fittings can be bought here: http://seemecnc.com/products/4mm-quick-connect-ptc-fitting

I am using a 624 bearing for the idler in the extruder. The x carriage uses a single 40mm fan to cool both hot ends with a common duct instead of the stock 25mm fans.

NEW---- 10/31
The motor mount has been updated to better support the filament using some 2mm PTFE tubing to prevent softer filaments from buckling under higher print speeds.

video of the dual extruder setup in action : http://youtu.be/H1djLu2qJlc