PLA, PETG, and ABS After the Part Leaves the Bed

PLA is the spool that makes a new printer look competent. It melts at a friendly temperature, holds detail, and then softens in a sunny window or under a lamp. Use it for jigs that stay indoors and cool, for models, and for anything you can reprint without grief. Do not use it for a clip on a heater, a hook in a car, or a fixture next to a motor.

When the part has to keep its shape

PETG takes more heat and more abuse, and it strings if it is wet or too hot. It can bond to a bed so well that it takes the coating with it, so use a release layer the maker of the bed agrees with. ABS goes further on heat and can be smoothed with a solvent process in a controlled setup, but it wants a warm enclosure and it puts fumes in the room. If you cannot enclose and vent, choose a different polymer instead of hoping a cracked window is a system.

None of the three is a metal. Layer lines are the weak plane. A bracket printed flat may snap in a way the same shape, printed on its side, resists. The material choice and the orientation are one decision.

• Match nozzle and bed temperatures to the spool label first.
• Keep spools dry, especially PETG, and re-dry if the surface foams.
• Do not mix a shop food surface with any of these melts.
• Reprint in the stiffer orientation before you switch brands.