PETG is the maker's workhorse: UV resistant, chemically durable, and heat tolerant. However, its hygroscopic nature causes severe stringing, popping, and rough outer walls if exposed to ambient air.
Key Rules for Clean PETG Prints:
- Dry it before accusing your retraction: 65°C for 6 hours in an active filament dryer. A silica box does not remove bound moisture!
- Retraction tuning:
- Direct Drive: 0.8 mm - 1.2 mm at 40 mm/s.
- Retract on layer change: Enabled.
- Wipe while retracting: 2 mm.
- Travel Speed: Bump non-print travel to 250 - 350 mm/s so strings snap cleanly before hair-like cobwebs form.
How do you store your engineering spools? Share your dryer and drybox setups!