More adventures in PET-G?
So I've now done two prints in PET-G, both of them had (different) problems.
1) My (tall) print experienced two layer shifts
2) On ONE face (ie. not all directions, just one) I got a large number of print zits:
3) On the same tall print, the brim I added for stability acted more like a raft (I thought they were supposed to be easy to take off!)
4) On the second print, One piece of wall had a large lift off the bed (it was sticking up about 2-3mm), which would have caused problems in future layers, I had to exclude that piece from the rest of the print.
5) On the second print, one of the pieces which is supposed to basically have a flat surface, spagettified. But only on that surface. There was not even a feature on the piece at the location that seems to be the point of origin for the spagetification.
6) It seems that, at some point, one of the pieces seems to have shrunk and lifted off the bed, despite otherwise printing perfectly.
Both prints were using the default profile for Prusament PET-G (240 / 85 degrees for first layer, 250 / 90 afterwards). For the second problem I increased the retraction distance from 0.8 -> 1.0 mm, which seems to have alleviated the zits issue (That's the kind of advice I saw online).
I've been trying to print the parts for the enclosure V2, the 'tall' parts (which I printed first) I did with a brim due to seeing online reports that they were unstable/fell over/failed without it. The other print I printed normally with the exception of increasing the number of walls for strength.
I am pretty sure my z-level is dialed in now (unlike my previous post). I did not have these kind of problems with PLA. Is there something I need to be looking into to help solve these issues I'm having printing with PET-G? These parts need to be printed in PET-G because they will be exposed to the inside of the enclosure, and I don't want PLA going soft, etc. PET-G can withstand higher temperatures (and it's not going to get crazy hot inside the enclosure, just hot enough that I would be worried about PLA. When printing PLA I will leave the doors open).
Any advice?
Preston
I wanted to change the world, but God wouldn't give me the source code.
RE: More adventures in PET-G?
I may have figured out the stringyness problem. It appears my exclusion was not QUITE wide enough (the part got slightly bigger as it grew), and so it was still trying to print a line of the part I had excluded, which then got attached to the next part.
I wanted to change the world, but God wouldn't give me the source code.
RE: More adventures in PET-G?
Next attempt to print the failed part, and it seems I had a 2nd layer catastrophe (ignore the top-left corner, I bent that pulling it off the print bed)
I wanted to change the world, but God wouldn't give me the source code.
RE: More adventures in PET-G?
Clean bed with dish soap, no alcohol needed, an get first layer 100%, then parts will stick the best.
Also a big brim attach to model will help with sticking.
If it still not works, print hotter and/or hotter bed.