PETG

Updated 1 month ago ​by Martin Lexa

PETG or Polyethylene Terephthalate Glycol is a very tough material with good thermal resistance. PETG has a low thermal expansion, so even when printing big objects without an enclosure, it practically does not warp. It’s almost as easy to print as PLA, but it can offer many mechanical properties that PLA prints just can't. It is less brittle, ductile and cannot burn. It also offers a healthy amount of flexibility which can prevent parts from breaking under stress.

PETG is used universally but is especially suitable for mechanical parts for both indoor and outdoor use. We use PETG to print parts for our printers! Plastic bottles are made from this kind of material.

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 PrusaSlicer, we already did that for you and the amount of stringing is minimal. If you still witness a tiny bit of stringing, 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. However, sometimes it could stick a little bit too well, and you could rip a piece of PEI coating from the bed. To prevent that from happening, apply a separating agent (e.g., glue stick) onto the print surface.

PETG is commonly referred to as PET. In general, both names are synonymous, although pure PET filament also exists. It is, however, much more difficult to print with and does not offer any real advantage.
Recommended nozzle temperature: 230°C for the first layer, 240°C for the other layers
Recommended bed temperature: 85°C for the first layer, 90°C for the other layers

Easy to print

Possibility of stringing

Good layer adhesion

Not soluble in acetone

Very tough and durable

 Bonds strongly to the print surface

Low warping

High temperature resistance

Water and humidity resistant

Make sure the print surface is clean, as described in PEI print surface preparation. However, it is not necessary to use isopropyl alcohol as the adhesion may be too strong. 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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