So I got the 0.2mm Nozzle for my P1S to do some Detail Heavy stuff, while with PLA everything works perfectly Fine, Once I try to use any Roll of PETG HF it just refuses to Stick to the Plate!
I’ve been Mostly Testing on my Coolplate Supertack, but same issue happens on the Textured PEI. Both of them have no issues when trying PLA the Print before.
I’ve now tried a Range from 230c° to 250c° for the Nozzle and 60c° to 85c° for the Headbed with only limited result, as Only the Combination of 250c° and 85c° for the Heatbed got me the Brim around the Print to stick, but not the print itself.
What am I overlooking here? Is there some settings I need to adjust when switching Nozzles? Dp I need to go even Higher with the Temps? Maybe its the Flow Ratio? I’ve tried both the reset one and the one that was set with the 0.4 Nozzle with no real change. Cant run a new calibration for it since nothing sticks. Both spools of Filament have been dried for 48 Hours, with a few hours of resting before use ofcourse.
To note, PETG HF works perfectly fine on the 0.4 Nozzle and both Plates have been cleaned multiple times now… as seen to work with PLA. What settings work for you folks? Anyone with simular issues?
All my petg experience is with a .6 nozzle, printing on a glass bed, but there’s some takeaways that hopefully apply to a .2 one…
Going very slow and increasing extrusion width helps a lot. And keeping acceleration low-ish, decreasing travel speed too much doesn’t help ofc. The narrow extrusion of a .2 nozzle reduces the surface area of a single line even more, so probably you need to increase the line width even more.
Additionally, I’ve read somewhere that petg kinda likes to stick to brass but not glass. So having the bed as hot as you can get away with for the first layer and the nozzle as cool helps too.
Use glue.
While that will definetly help for my Current project, I do wanna get to the bottom of why it stopped working and fix it once and for all!
PETG never sticks well on any bed plate on our Prusa Mk4 for some reason, while it seems to stick very well on the plates coated with the same materials on our Prusa XL.
I tried to change a million parameters, and then I gave up trying to understand, because at some point all I want is to stop wasting filament and time, and get the parts I need.
So I use glue and I spent 2 minutes wiping off the glue in the sink when it’s done. It’s just pragmatic and it lets me get on with the rest of my life.
Hm I see, if anything im glad to not be the only one with such Oddball issues! I’ll keep my expectations at bay incase this does end up hopeless
Have you tried increasing your first layer extrusion width? A wider first layer will squish the filament into the build plate more, which might help. I use a 140% first layer width.
That’s how I solved my adhesion issues as well (with ASA and a .3 nozzle, but should be the same in principle).
Oooo I will try that now yes
Are you able to mess with the first layer offset on the bambu printers? May need to bring your nozzle a bit closer, especially with a textured surface. Temps seem comparable to the stuff I have on hand.
For cleaning, is soap and water compatible with your surface? Personally found that while IPA is fine for maintenance, a few drops of unscented dish soap in water works extremely well as a degreaser, I’ve literally washed stubborn surfaces in the sink. Petg is super picky with any residual oils and the small nozzle could totally make that worse.
Maybe try running slower? Just to eliminate variables, may be worth running a quick extrusion calibration? Petg can be an absolute pain for bed adhesion in my experience.
I would try lowering layer height and slowing it down, especially on initial layers
Aside from adhesion itself, maybe that specific filament is (also) underextruding?
I have has a batch of 1.75mm filament that was actually something like 1.6ish. I tried to have it stick, but nothing worked because it simply wasn’t extruding enough.
I eventually measured it with calipers, set that in the slicer and then it started worked fine.
Similarly, maybe your .2mm nozzle has a partial clog?I can try to messure my Filament, tho this would suprise me as the same Filament works just fine with the 0.4mm Nozzle. I doubt that the Nozzle itself is clogged as it is Brand new and freshly build in
