Hi everyone,
I've been successfully printing with a printrbot Ubis hotend for quite some time now, fairly impressed at how reliable it's been. I'm interested in upgrading to a dual extruder at this point, and the qu-bd extruder looks pretty interesting. However, the reviews I've seen scattered throughout the web have been overwhelmingly negative with regards to jamming.
Have they managed to sort out any of the problems yet? Is it any more reliable with the filament pusher replaced with a hobbed pulley and something like this: [
www.thingiverse.com]?