Welcome to the SeeMeCNC Community

I cannot seem to find any info on setting the screws for the end stops. I have looked through all the documentation. I must be missing it. I bought this used and the calibration cube came out within .1mm on the first try after I fixed a couple things. However, I think I should double check these are set right? I just cannot find any info to do it.
If someone could point me in the right direction.
In the mean time I remember there was an older set of build docs, maybe I will look through those...

If you've got a V3, you don't need to adjust the endstop screws - the automatic calibration takes care of all that. It'll tell you if they are too far out of whack and needs to be manually adjusted.

Hmm. how does it know the hot end assembly is level? I know it taps the nozzle to set the height. Does it use the coordinates from the 3 points it measures to calculate level since the geometry of the arms etc is fixed and known?

Yup. It gets to do a bunch of math. If your first layer is looking good, stop there. If you've got high/low spots you want to iron out, you can make it go away with some more math, just follow the instructions here: https://www.seemecnc.com/pages/delta-calibration-wizard

So far I printed 3 things and they all came out good. They could benefit from a few little tweaks, but no issues with calibration of the bed! I am liking this printer. That piece of paper sliding around forever crap is for the birds LOL.