Issues printing text with PETG burning and scarring
I have had my MK3S+ for about a month and have had great success building the kit and printing the included prusament PLA with all the different bundled models as well as a few other things. I then was able to dial in my textured sheet reasonably well and print some simple plant markers using overture white PETG, which had just a solid label portion with no text. When I try to print with a text inlay, I get the smearing/scarring as well as some burning in a few spots, which is pictured above. I had someone on reddit suggest possibly moisture in the filament, but as I said it printed fine doing everything except the text. Is there some other suggestions to remedy this? Is there a way I can tell prusaslicer to use different settings for only the text portion of the model (go slower, or higher z offset maybe?)
RE: Issues printing text with PETG burning and scarring
Looks to me like it might be some small blobs of scorched filament on the nozzle area coming off onto the print.
Do you clean off the nozzle area regularly?
RE: Issues printing text with PETG burning and scarring
I've had intermittent issues like this with petg. I've been slowing dialing back my extrusion multiplier after having tune everything else such as temperature(from a temperature tower) and the zOffset with the 75mm square. Using two of my petg filaments for example, eSun and Paramount3D. After figuring out zOffset to get a nice adhesion and a nice 75mm square, I had assumed things would be fine. But win printing anything with long runs, say 75% or more of the length of the bed, I could see small amounts of filament building up on the nozzle while printing. I figured the easiest way to reduce the amount of filament being extruded was to lower the extrusion multiplier. I slowly lowered this number on successive attempts and a value of .88 allowed a 20 hour print to go without the artifacts you describe. I've recently printed temperature towers for several of my filaments to get the temp dialed in first before tuning things like retraction and extrusion multiplier.
But TLDR; watch the nozzle closely during the first layer and periodically during the print. if you start seeing buildup at all, then either you're too close, or if you've tuned your ZOfffset then you might simply have too much filament being extruded and need to dial back the extrusion multiplier. But I'd make sure that you're printing at the temp that looks best on a printed temperature tower first.
RE: Issues printing text with PETG burning and scarring
Just rub a bit of orange Habanero on it : )
Sorry couldn't resist 😜
The Filament Whisperer