Printing in PETG (Patreon)

For those wanting to print in PETG, it can certainly be done.

This was on my Ender 3 Pro with a direct drive extruder. Printed on a smooth borosilicate print bed using Overture PETG filament and Layerneer bed weld.

Ultimaker Cura slicer using 0.20 standard quality settings with these adjustments:

Hot end temp: 235C

Bed temp: 100C

8 mm brim

20 mm/s initial layer

25 mm/s top/bottom and wall speed

35 mm/s infill

4 mm retraction

75 mm/s retraction speed

I like to print slow.  

Working with PLA, I've always over-extruded the first layer for better adhesion. PETG doesn't seem to tolerate that very well. The extra material tends to break loose into strings or collect around the nozzle until it's left as a glob somewhere on the print. No bueno! By relying instead on other methods of improving adhesion (bed adhesive and higher bed temp to combat warping), I've been able to eliminate the stringing and get some really clean first layers.