What is this print defect?
Hi Prusa forum. I had a print defect, can you help me figure out what this type of defect is called? Print stats:
- MK4 - Input shaper
- 0.4n
- PETG - Normal temperatures
The image shows the printed part in upside-down orientation compared to how it was printed. As we can see in the image, this seems like a layer shift. However, the other side of the printed part looks perfect. I was under the impression that a layer shift entailed an entire layer being shifted, not just part of it.
So does this type of defect have a name, and how would one counteract it? Thank you in advance.
RE: What is this print defect?
Update: I tried printing the exact same thing again just to see if it was a fluke. The same problem arose, but less pronounced this time. I'm wondering if it could have something to do with my positioning of the piece on the build plate. I placed it on the corner (since I read on the forum of a dude doing it to even-out the wear on his build plate), but the corner of the build-plate coincides with the corner I've got problems with. I have an enclosure (+ air filter running) so I assumed printing close to the edge wouldn't be a problem, but maybe.
I'll try printing the same print right in the middle of the build plate to see if the same problem arises, I'll post again in a few hours!
Minor warping doesn't always display the classic ripple features, when there is an adjacent space like this print there is room for the excess to spread. You might find a brim enough to fix it but I would give the print sheet a thorough clean, concentrating in that corner, first.
Cheerio,
RE: What is this print defect?
Its harder to tell with the textured surface plates but to me it looks like your part is warping up slightly in that corner. Due to contraction forces when printing parts will have a tendency to try and lift. If course the degree of this effect is highly dependant on the material and shape of the part but all the plastics do it to some extent.
This is why good bed adhesion is so often stressed. If you don't have it then so many problems will arise. When a section lifts slightly then there isnt enough room form the extruded plastic anymore as that section is fractionally closer to the nozzle now. This leads to extra compression and you get what you have pictured.
Common remedies include - make absolutely sure of your bed cleanliness. You want zero grease or oils. Once thoroughly clean do not touch the print surface.
Dialling in your live z so its perfect. More difficult to determine on a textured plate.
Making sure there are no drafts in the printing area. Usually through the use of some for of enclosure.
Use of brims to increase the surface area. Although with that part this is not needed. There is more than enough surface area.
Putting your part in the corner was a mistake though. Its a well known fact that the edges of most print beds (certainly the Mk3 and Mk4 beds) are cooler than the middle. That alone will reduce adhesion in the corner.
RE: What is this print defect?
I just finished my print that was placed in the center of the print bed. The problem disappeared. I suppose this must have been that this specific corner loosened from the build plate due to uneven heat distribution.
Thank you both for your insights!
RE: What is this print defect?
I always print in the center of the sheet whenever possible. It's always going to be more stable temperature wise unless you have an enclosure.
RE: What is this print defect?
I always print in the center of the sheet whenever possible. It's always going to be more stable temperature wise unless you have an enclosure.
Apparently even with an enclosure, as was the case for me!