Posted by: @eastmemphis

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! 

Thank you both for your insights! 

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.  

Cheerio,

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! 

• 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.