PETG

Updated 3 days ago ​by Tomáš Chvalina

PETG is a very tough material with a good thermal resistance. It’s universally used but suitable especially for mechanical parts for both indoor and outdoor use. PETG has almost no warping, so printing large objects isn’t a problem. We use PETG to print parts for our printers!

PETG is one of our favorite materials for 3D printing. It’s almost as easy to print as PLA, but it can offer many mechanical properties that PLA prints just cannot achieve. The G in the acronym PETG stands for Glycol which is added during the manufacturing process. Glycol modifies the properties of PET, so that it’s easier t o print, less brittle and clearer when printing with semi-transparent variants. PETG has low thermal expansion, so even when printing big objects, and without an enclosure, it rarely lifts from the bed and warps. In addition to that, PETG is ductile. It has a healthy amount of flex which can prevent parts from breaking under stress.

Unlike PLA or ABS, PETG tends to ooze a bit and may leave strings of plastic on your print. You can fight this with increasing retraction and playing with hotend temperature, but if you use our filament presets in Slic3r or Prusa Control, we already did that for you and the amount of stringing is minimal. If you witness a tiny bit of stringing anyway, you can get rid of it by quickly blasting your finished prints with a heat gun.

PETG sticks very well to PEI, which is generally a good thing. But sometimes it could stick a little bit too well and you could rip a piece of PEI from the bed, so you should use a separating agent (e.g. gluestick).

If you can handle the oozing and strong adhesion, you’ll be left with a very durable print, that is considerably temperature resistant and usable for both indoor and outdoor use. 

ADVANTAGESDISADVANTAGES
Easy to printPossibility of stringing
Good layer adhesionNot soluble in aceton
Very tough & DurableProne to scratches 
Low warping
High temperature resistance
Little shrinking 
Nozzle temperature: 240°C
    Bed temperature: 80-100°C
    Heatbed: Make sure the surface is clean, as described in PEI print surface preparation. Do not use isopropyl alcohol to clean the bed, or the adhesion may be too strong, if you do not have anything else on hand use the bundled glue as a separator after cleaning it. Windex or similar windows cleaner is a great option for PET and you don’t need to use the glue after the cleaning. Pour a little amount on an unscented paper towel and wipe the print surface.


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