I've mentioned in a couple of posts that I'm working my way through https://teachingtechyt.github.io/calibration.html. The Slicer Flow Calibration section involves printing a single wall hollow cube that I'm sure many of you have seen/printed.
I had been printing PETG at 235C for the hotend & 70C for the bed. While printing the 1st cube I noticed the bottom corners were lifting off the bed: i.e. they were warping. I tried lowering the bed temp to 60C. I didn't need to even let the print finish to see it wasn't working. So, I started a new print with the bed at 80C. That made the difference:

If you look at the larger version, you can see that there is still a tiny bit of warping. I decided to raise the normal bed temperature to 85C. There is also a small amount of elephant's foot, which I'm hoping the rest of the sections at the Teaching Tech site will help me eliminate. I am wondering if reducing the 1st layer flow a bit will help. Or, maybe, changing the Z Offset a bit, although I'm hesitant to do that.
Both prints were done using Magigoo on a glass bed.
I had been printing PETG at 235C for the hotend & 70C for the bed. While printing the 1st cube I noticed the bottom corners were lifting off the bed: i.e. they were warping. I tried lowering the bed temp to 60C. I didn't need to even let the print finish to see it wasn't working. So, I started a new print with the bed at 80C. That made the difference:
If you look at the larger version, you can see that there is still a tiny bit of warping. I decided to raise the normal bed temperature to 85C. There is also a small amount of elephant's foot, which I'm hoping the rest of the sections at the Teaching Tech site will help me eliminate. I am wondering if reducing the 1st layer flow a bit will help. Or, maybe, changing the Z Offset a bit, although I'm hesitant to do that.
Both prints were done using Magigoo on a glass bed.
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