Unable to get PLA or PETG to stick to a Prusa textured powdercoated plate
I'm able to get prints & z height properly tuned on my Prusa mk3, now mk3s. Mostly PLA there & all the usual cleaning stuff.
However on the newish Prusa powdercoated plate I'm unable to get any consistent bed adhesion. I'm mostly only trying PETG here. Clean it with 90% isopropyl, wash it with unscented degreasing dishwashing soap, dishwashing soap + a green scotchbright pad. I let it dry on the heated bed for a bit if it got wet.
The smooth sheet generally takes about a -.500 offset. Even after properly re-calibrating when switching plates, I've tried -.400 to -.630 on the textured sheet with all vary from bad to worse. It generally seems like the PETG wants to stick to the nozzle & once that starts it just gets worse most of the time collecting all extruded material. I've got an hardened E3D Nozzle-X these days. But I was having similar issues with a stock brass nozzle last time I tried fighting with the textured sheet last year.
These are some of the best calibrations I've managed to get & they are generally unusable.
I just tried drying the PETG in the oven at 160f for 4 hours. No luck. I finally went back to the standard build plate with the dried PETG & got a good temperature tower (I manually broke it checking for layer adhesion at the various temps). It's been a while since I messed with PETG & was uncomfortably close to over-adhesion on the bed due to cleaning it with soap, scotch-bright then alcohol. Easy enough to fight that with Windex or not cleaning the bed as much though.
Any suggestions on what I might be doing wrong? I'm almost to the point of trying glue stick or the like, despite all the official Prusa documentation saying it's not needed or recommended.
RE: Unable to get PLA or PETG to stick to a Prusa textured powdercoated plate
Oh, an I know it's always going to be stringy as PETG. I can deal with a little stringy if I can get a decent first layer to stick. Either live with it & post process with a mini-torch and/or tune my settings a bit.
RE: Unable to get PLA or PETG to stick to a Prusa textured powdercoated plate
I'm having the same issue with PRUSA PETG and a new textured plate. Cleaning doesn't help. Adjusted live Z and can't get it to stick.
RE: Unable to get PLA or PETG to stick to a Prusa textured powdercoated plate
3D printer first layer problem | Calibration process
This how it should look like, see movie.
Clean bed 2 or 3 times with dish soap, this is very important, no alcohol needed.
First layer , most users need to go lower if it fails.
Clean nozzle so filament can not stick to it.
This normally not needed, but you if it still fails:(if you need this then your settings are not good)
First layer speed, go slower.
Extrude hotter for the first layer.
PLA sticks not good to the powder coated bed.
RE: Unable to get PLA or PETG to stick to a Prusa textured powdercoated plate
I was able to make some progress with prusament petg galaxy black and the textured print sheet. In my case, the cleaning made only a small difference. Temperature and live Z value were biggest issues. My thoughts:
Problems:
1) material has small reflective particles so it is very difficult to see layer quality
2) the first layer calibration routine in firmware is too short to accurately set the live z value.
3) the fist layer calibration routine runs only at 230C while this filament says to use 250C =/-10C. I couldn't find any adjustment to this.
4) I had no idea how much difference to expect in the smooth sheet vs textured sheet live z value.
Solutions:
1) posted elsewhere is a 75mm x 75mm single layer Gcode file from JeffJordan. This gives you lots of time to adjust the live z.
2) I edited the file to use the proper temperatures for petG
3) I made a methodical changes of .050 using his method until I found the best value. In my case, the smooth sheet live z value is -.717 while the final value for the textured sheet was -1.05. This delta may give you a target to work with.
Afterwards, the adhesion was much better.
RE: Unable to get PLA or PETG to stick to a Prusa textured powdercoated plate
I got the same kind of problem. PETG was ok, but PLA didn't stick.
When I increase bed temperature by 10°C for PLA it worked fine.
RE: Unable to get PLA or PETG to stick to a Prusa textured powdercoated plate
@peter-m26
I had tried to calibrate for the textured sheet using Prusa calibration and PLA I got it calibrated but when I tried to print something it would not stick.
I assumed you shouldn't use scotch brite on powder coat, but that's what did the trick for me. Washed it with Dish Soap and Water using Scotch Brite , then ran your g-code using (two year old) E-Sun PETG with the Live-Z settings I had from before. Stuck like glue (well, not quite) but it stuck. Thank You
Peace, Love & Applesauce.
RE: Unable to get PLA or PETG to stick to a Prusa textured powdercoated plate
The difference in Live-Z for me between smooth and PC sheet is ~0.300mm. PC has the larger negative number.
You imply that your live-Z is roughly the same. When I run on the PC sheet without changing it in settings, i can't get anything to stick either.