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It was a setting in vanilla marlin.

Follow this guide and you should be ok:

https://www.reddit.com/r/ender3/comments/e894j7/marlin_20x_guide_for_ender_3_using_skr_mini_e3_v12/...

You may not like my advice here, because I'm sure you've sunk some serious hours into your design, but just buy an off the shelf pressure relief valve and adapt it to your tubing.

Real engineers...

Sorry, I meant the x carriage. I had a problem with the blobs coming out that I traced to the x carriage bouncing up and down because I'd installed a direct drive upgrade for my printer and not...

Hmm, maybe check the eccentric nut on your x carriage, if it's not tight enough you'll see that kind of spurting caused by the nozzle actually being pushed upwards a little as the goo is forced down....

Printer: Ender 3 pro, basically nothing is stock. Of note I just upgraded the mobo to an skr mini e3 2.0 and flashed marlin 2.0.6, Bltouch bed leveler

Hello, my ender 3 grinds horribly when auto...

I found there's a small sweet spot with the extruder spring tension that you have to hit. For example, on my Ender 3 2 washers on the spring seat was squishing the filament, but none wasn't enough...