@zrail They looked cheap on Amazon, but this is my second spool from them and so far so good with printing problem free

@amy Look in the mirror. Imagine a roll axis that runs through the pupil of each of your eyes. Now tilt or roll your head left and right - not turning, not nodding, but tilting.

If you look very closely, you’ll probably notice that your eyes twist along the roll axis opposite to your head tilt. This is called torsional motion and some people have learned how to do it voluntarily