Here is a post that explains how to set the z offset
viewtopic.php?f=7&t=7959&hilit=M206

This stl should be 3mm tall when printed and the thickness of the wall should be .8mm +.01-02 if extrusion multiplier and Z offset is correct

Setting your Z offset correctly with a calibration square with each and every layer height change.. i.e a .15 layer height requires a different offset than .3mm layer .. A 70 degree bed vrs 110 degree bed will require a different z offset. Just so you can see what is very possible these parts are pr...

If petg is not sticking to your glass or polymide tape, your Z offset is not set correctly, or you are printing way to fast. I have had PETG remove a chunk of glass from my stock glass plate when not using tape..

I am going to guess here.. Over sized to prevent it from running at max output all the time. Better to have more power and step it down than not enough. Has a power supply ramps up and heat goes up output goes up, voltage can drop.. Did a quick google on the subject.. https://www.google.com/search?q...

Added them to my wish list for birthday.. but even the smallest would be too big for the pinion in this use case.

Thanks Ed! I get some 648 ordered so i have it on hand..

Ed the issue is the new pinion gear will drop right on, no pressing need, spins like a fidget spinner. Hole in gear is bigger than the shaft.. .01-02mm maybe more.. Was hard to get a good measurement with the caliper. Will you magic juice work on that?

Update: I tried to install some old Makergear PLA which is hard as a rock (going in the trash now) and it stopped the extruder, spinning the shaft in the pinion gear. I had purchased a replacement gear from MG knowing this would happen at some point.. took off the motor, pulled off the old gear and ...

there is a slightly modified version of the current makergear extruder on thingyvers that was altered to make printing tpu easier.. That along with a new drive gear make all the difference in the world with TPU and other soft filament.

Sounds worse than the old manual method of printing the appropriate 2 walled square, measure and make z offset change with M206 and M500.. Why in gods name would you need to run a mesh level with every print.. manually level the bed, run mesh and be done with it for the year.. My simple M2 does not ...