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Posted by hokanp 
January 09, 2018 11:25AM
Someone have advices for Printing with PETG?
Temp, Speed....compared with PLA
January 09, 2018 11:43AM
I found PETG a fair bit more touchy. My hotbed is PEI and I could not get any stick at first, then I upped the temps a fair bit for my first layer. Then I had trouble getting it off!!

So here is what I found worked for me after I got it all working ok:

Hot End temp first layer 235c
Hot End temp 220c
bed temp first 5 layers 80c
bed temp after 65c

First layer print speed 15mms
print speed 35mms
infill speed 35mms
travel speed 70mms

fan speed 40%

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:

bed 60c
hot end 190c ish
fan 100%

speed 60-80mms

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.
February 16, 2018 08:56AM
Going to steal this topic but,

Is it normal that I cannot print Esun white petg over 27mm, after that it just sticks to nozzle.

Temps are something like 240c or 245c and hotbed is 60c
February 16, 2018 11:49PM
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.
February 17, 2018 01:37AM
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.
February 20, 2018 03:06AM
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...
February 20, 2018 05:30AM
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.
February 20, 2018 05:44AM
I´m using 0.4mm nozzle. Layer height is usually 0.2mm or 0.3mm. I´m in process to order newer type of hotend-block to be able to use silicon socks.

Extruder is working and wont click at all, I too use a little underextrusion of 0.96 to 0.98. I don´t use cooling at all, ´cause it destroys last rips of layer adhesion I have...

Bridging is almost perfect with my settings and no stringing or oozing at all, could it be just cold extrusion?
February 20, 2018 05:56AM
I'd say start using socks(on the printer that is..grinning smiley) 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.
February 20, 2018 10:08AM
Maybe there something in my nozzle, if I extrude in the air I got loops. Start of the filament stucks to nozzle and rest of extrude go straight down making loops...

Edited 1 time(s). Last edit at 02/20/2018 10:10AM by kapperi.
February 20, 2018 10:34AM
If you have loops during extruding in the air, there's something in the way. Be it a particle or burrs, you must remove it.
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