Prusa i3 MK3 PETG tips

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Last week I’ve received three rolls of Amazon Basics PETG filament. My filament choice was PLA. I’ve also a roll of ABS but I don’t use it anymore.
According to the internet PETG combines the best from PLA and ABS into one filament: Easy to print with no warping like PLA and nearly as strong as ABS. It’s save to use for food (for example cookie cutters) and UV resistant.

PETG loves sticking to PEI

I’ve read on the prusa forum and subreddit that PETG loves sticking to PEI. It sticks so well, that you can damage the PEI sheet when you use too much force while removing the object. A simple solution is using a simple gluestick.
Apply a thin coat of glue on the cold PEI sheet where the object will be printed. Heat up to temperature and start printing. Removing the object will be easier and chances damaging your print bed is reduced.
You can clean off the glue from the PEI sheet and object with pure water.

If you are switching to another filament consider wiping your bed off with acetone or an alcohol.

Increase the hotend temperature

If I remember correctly, the default temperature in Slicer PE for PET is 230 °C. That’s a bit too low if you ask me. I’ve cloned the default PET profile and changed the following settings:

I’ve printed two Key racks from thingiverse (🖇️ 🔐) .
Print settings were both the same: 0.2mm layer height, 5 outer lines, 25% honeycomb infill. The one with the default profile was not stable enough to hold my keychain and broke pretty fast. The one printed with my modified profile was not so easy to break.

Increase your Z value

If you have warping issues you can increae your Z value about +0.100. PETG likes to be squished together. If you don’t have warping issues I would not recommed increasing your Z value.

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