Two different problems. First with y endstop, and not really an issue with the endstop, more the cables. They keep wiggling out of the nook you’re supposed to stuff them into, and that causes them to get pinched when homing. The cable is just thick enough that it prevents the endstop from triggering.
The other is Klicky, I get wildly different readings to the point where it just gives up because the tolerance was exceeded too many times. I’ve checked for loose screws, belt tension, etc., can’t find anything obvious. I’ve basically given up on Klicky and ordered a Klicky PCB kit, hopefully that will fix it.
That’s my guess with the 3kg, too. Probably need a holder with bearings. I plan on printing this holder (printables.com/…/513779-voron-horizontal-filament…) because I need something a little more forward based, I’ll let you know how it goes.