This is for any HIC Technologies HICTOP Prusa i3 and will use the original hotend setup, however replaces the direct feeding extruder motor with connection for PTFE line fed from Bowden extruder.
I got my second HIC HICTOP Prusa i3 kit, this time the aluminium chassis version. I am planning to customize it to dual extruders later on and I have ordered E3Dv6 hot ends that are currently being shipped. In the meantime I have already made one of my Bowden extruders and I figured I can start using it while I'm waiting for the E3D hotends to arrive.
Edit: Could work with this thing: http://www.thingiverse.com/thing:1654916
My sweet-spot for strong parts made from ABS is at 55% infill. You can choose whatever works for you. I strongly suggest ABS or other material that is more resistant to heat.
If you are planning to use this setup long-term I would suggest to insert heat-resistant cotton or fiber between the aluminum block and the printed part to protect it from heat. I have been using it for a few hours of printing without anything in between and have not run into any heating or melting issues yet, but I'm only printing PLA at the moment and it will probably not last long for ABS printing.