by RetireeJay » 2016-May-Tue-14-May
Printrbots (and other printers that use Marlin firmware) do have a minimum printing temperature. By default it's 170C. That's to prevent the extruder motor from trying to push filament through a hot end that's not hot enough to melt plastic.
Of course, you could change this with one simple edit to Marlin's "Configuration.h" file and re-compile to create a compatible firmware.
Printrbot Plus operational January 2013
Brass threaded rods (5/16" X 18) & nuts for Z axis
GT2 belts & pulleys
Cable chain to reduce probability of fatigue failure in wires
E3D V5 Hot End, 0.4mm nozzle, also 0.8 and 0.25 in use occasionally
PB fan mount + 40mm fan -- using printed mount adapter, not the E3D supplied fan
Injection molded extruder gears
Optical Z "endstop" (custom designed and built)
Have used many pounds of T-Glase filament. Now also doing some work with Ninjaflex SemiFlex
Print on glass with Scotch Craft Stick or other glue stick