Mendel Custom Hot End (using some makerbot Mk5 hotend parts)

I had been using a variant on the original mendel hot end ( http://www.thingiverse.com/thing:2018 ) and was constantly getting heat transfer up to my (sadly) PLA printed extruder parts. These parts were actually deforming a little under the heat. So I redesigned to fit my needs.

This is a new hotend design borrowing from from makerbot's MK5 extruder (see http://www.thingiverse.com/thing:3290 ).

It has a nicrome wrapper cylindrical solid aluminum core and fits into a PTFE sleeve at the to