I just got my first spool of PETG and tried to calibrate an Ultimaker Cura profile for it on my Ender 3 today with limited success.
I've had severe issues with the filament not sticking to the build surface, instead balling up around the edges of the nozzle tip. (rather like this post) Sometimes it sticks alright, but that happens properly > 50 % of the time. I've never seen this behavior with my PLA materials.
So far, I've only been trying to print this calibration part.
Relevant Profile Params: (let me know if I need to post more, I think these are the relevant ones)
- Layer Height: 0.2 mm
- Nozzle: 240 °C
- Bed: 60 °C
- Print Speed: 60 mm/s (more specific params left to auto calculation)
- Travel Speed: 300 mm/s (max)
- Cooling fan
- Initial: 0 %
- Fan Speed: 100 %
- Distance: 5 mm
- Speed: 50 mm/s
- Skirt min length: 250 mm
I was initially going by advice from Thomas Sanlanderer's video on PETG, starting with 230 °C/70 °C, but when that really didn't work, I then tried the advice of a Reddit user (can't relocate thread) that said to try a lower bed temp. I then experimented with different bed temps in the 50's to mixed avail. Most other threads are talking about PETG + glass, which seems to work well with a PVA glue stick surface finish.
I'm getting a glass build surface soon (as soon as GearBest can ship it from across the pond), and I hear that will help, but in the meantime, I want to find a way to make it work with the fake Buildtak. What can I do to try to make this work better? My thinking is that the issue is with the bed config (temp, surface, etc.) and not with the nozzle temp, but I could be wrong.