I have not used PLA in many months I got away from it and was doing ABS for quite a while.
as I recall I was around these settings:
hot end 190c ish
oh and one more thing, I found I had to back off my first layer more, with PLA and ABS I got used to squishing it into the plate on my first layer. With PETG I found I had to reduce that squish ALOT!!
I am almost just laying the first layer down now, I would say my nozzle is .29mm from the bed and laying down a .3mm first layer
right now I am struggling with over extrusion causing a buildup on my nozzle, but if I reduce the extrusion multiplier I get gaps in walls...
Edited 3 time(s). Last edit at 01/09/2018 11:47AM by JustSumGuy.
Filament rolling off the bed is a sign for a wrong nozzle height. As mentioned above, too much squish will dip the nozzle in the filament and drag it away.
Babystep the nozzle up in 0.02mm increments until you find the sweet spot.
Edited 1 time(s). Last edit at 02/16/2018 11:49PM by o_lampe.
First do a 'Vase mode' test to see if extrusion is ok. 'Extrusion Multiplier' setting is completely different compared to PLA or ABS.
And indeed squeezing the first layer PETG onto the bed is not a good idea at all..! It should be gently 'rolled' on the bed(like o_lampe mentioned higher up). iow the nozzle should be set higher compared with PLA or ABS. I first thought too that would result in not sticking to the bed, but no worries it works.
Lower printspeed. Print temperature should go up. Bed temp 75/80°C. For PETG and I always use 3D-Lac.
First layer NO partscooling at all. For the rest as little parts cooling as possible. You should find yourself a good compromise. The higher parts cooling the smoother/nicer the perimeters. On the other hand lowering partscooling during printing should result in stronger parts. Mine is set at 25%
Set retraction higher if stringing occurs, it surely will. Mine is set at 1.5mm(direct drive).
Do not test on a very small part, it will not work. That is mistake most print-nerds do. Small parts need to be printer with slightly other settings.
Those are good points all, but mine first layer is perfect (I think), maybe too good what comes to getting the parts out of the bed...
My problem is that in next layers when the speed should rise, I can´t get it to stick to previous layers and its sticking on nozzle. I´m doing first layer at 20mm/s and next layers absolutly maximum is 27mm/s...
There´s no problem with stringing and oozing... Retraction settings are now perfect at 2mm and 20mm/s...
Very strange story. I'm busy printing a PETG part this very moment, no problems at all.
Nozzle0.4, temp75/245°C Speed:55mm/s Layers0.2mm retraction:1.5mm 1stLayer no cooling other layers:minimum cooling Bed:3DLac. ExtrMult:0.92
I use silicone socks to 'cover' the heaterblock. Those silicone socks, I wouldn't print without them at all.
What's the nozzle's diameter you're using and what is the height of the layers.
I'd say start using socks(on the printer that is..) It's a BIG difference, you'll see...
You also mentioned filament sticking to the nozzle. Check that nozzle, clean it. Or maybe there a small burr somewhere in/or at the nozzle... somewhere...
Manual feeding the nozzle should always result in dropping the filament straight down. If not the nozzle is not clean or not free of burrs.