by RetireeJay » 2016-Sep-Mon-15-Sep
Moose and I are on the same wavelength...
Commercial machines that corporations buy for their R&D departments often use ABS (and rarely if ever PLA). But they definitely do use heated beds, and in fact they use heated chambers, with forced air circulation and very precise temperature control in order to make ABS parts that don't warp or crack. These machines are the size of large refrigerators. I'd be very surprised if you can make anything much larger than a stack of four or five pennies out of ABS on an cold-bed Printrbot without having problems with adhesion, warping, and cracking.
I've been using T-Glase, and it is much easier to print than ABS (it also doesn't smell, at least to my nose). T-Glase (a form of PET, similar to what they use for water bottles) makes reasonably strong prints that are more resistant to heat and degradation than PLA. I generally print with a heated bed, but I think T-Glase it would work for smallish parts if you use Elmer's Glue Stick on glass at room temperature. I also historically did a lot of work with nylon - which is extremely tough (I mean resistant to breaking), and also can be printed on glass with glue stick, or on Garolite (see Taulman3D.com). However, nylon is hygroscopic so it may warp during use depending on whether it's exposed to water or high humidity. Nylon is very bad for ooze (plastic dribbling out of the nozzle when it's not supposed to be extruding); T-Glase ooze is not as bad as nylon; I guess PLA must be even better for avoiding ooze based on pictures I've seen of beautiful prints.
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
"My next printer is..." Prusa i3 MK3, upgraded to MK3S