A few of us started a company that sells upgrades and replacement parts Printitindustries.com
The MK6 is the extruder which has been revised for the v6 and Lite6 hotends, which we carry as well as the hotends themselves.
I have actually pushed a few pounds of TPE and TPU out of this extruder type just fine
Printit Mason and Printit Horizon printers
Multiple SD2s- Bulldog XL, E3D v5/v6/Lite6, Volcano, Hobb Goblin, Titan, .9 motor, Lawsy carriages, direct Y drive, fishing line...the list goes on
Filawinder and Filastruder #1870.....worth every penny!