What is this problem and how can I avoid it please?
Hi there, I recently got MK4S and the first few prints were great, but now this happened. Does anyone have any idea what this could be?
I see 2 fails, the head and then the sword that broke. And when I set it back up, it looks like the top of it failed in the same layer as the head went wrong.
PS I have the kit.
You have had a layer shift, probably due to a head crash which in turn has two likely causes:
It might be poorly planned geometry, we would need to see the intended shape of the upper parts of the model to confirm this...
More likely, looking at the picture, is lowered adhesion due to a dirty print sheet. There are fingerprints all over it; thoroughly clean the print sheet before using it.
Also, change from grid infill to cubic or gyroid which will reduce horizontal stresses during printing.
Cheerio,
RE: What is this problem and how can I avoid it please?
Will change the grid infill, thx. However the print was holding very strongly on the print sheet, it didn't move on the sheet during the job. The top of the head just shifted to the side, thats all.
How does dirty print sheet affect a layer shift at 95%th layer at the top?
Also, acetone cleaning is ok, right?
RE:
The sheet truly looks—bad. At least give it a wipe with 90+ isopropyl alcohol between prints. Ideally take it to the sink and give it a good scrub with dish soap and hot water. No need to reach for chemicals such as acetone.
Having said that, my money is on the nozzle hitting the piles at the intersections of the lines within a layer. In particular if you're printing with a speed profile (which I hardly ever use, as my printers are perfectly happy to print during the night without me, and I care more for quality).
As Diem said, try (adaptive) cubic or gyroid. A model like this will probably print fine with Lightning.
Formerly known on this forum as @fuchsr -- until all hell broke loose with the forum software...
RE: What is this problem and how can I avoid it please?
On the other hand, his expression looks about right for someone slicing off the top of his head, and Wade will recover from that. 😆
See my (limited) designs on:
Printables - https://www.printables.com/@Sembazuru
Thingiverse - https://www.thingiverse.com/Sembazuru/designs
How does dirty print sheet affect a layer shift at 95%th layer at the top?
First layer and adhesion problems don't usually manifest until the print is tall enough that sway from the vertical allows an edge to lift into the path of the nozzle.
Also, acetone cleaning is ok, right?
On the smooth sheet only, once a year at most in an emergency, yes. In your case use dishwashing detergent (Dawn/Fairy) and plenty of HOT water.
Cheerio,
RE: What is this problem and how can I avoid it please?
In case it wasn't clear, different types of infill patterns work differently. Some cross paths whilst some don't. If they cross paths, they create small bumps where the paths are crossed, and it COULD be the case that the nozzle got snagged on one of those intersections/bumps. Here is a Prusa blog post describing different types of infill and which of them cross paths or not. 🙂 Good luck!
https://blog.prusa3d.com/everything-you-need-to-know-about-infills_43579/