Another thread about homing issues but at my wits end
So, Core one kit, assembled now since July. Mostly happy customer. A few weeks back I broke the left belt tensioner, (too much fiddling with belt tension tbh). TLDR - since disassembling the nextruder to replace the tensioner and reassembling, I have been having a nightmare with homing. Never had a homing issue prior to this, it would do a couple bangs and move on. Now after changing filament or just before (most) prints, I get an endless loop that I generally need to reset the printer for. Calibration passes ok every time. Hoping the community might just give me some tips as to specifics I could look at following the work I did.
I have a couple more relevant details. I also changed my linear rail brackets. I always had issues with resonance noises. Between prints and when I had the time I'd try one of the many suggested fixes in the forums. Run a "noisy" print and pray... (that my wife wouldn't kill me for spending more time with the printer than her and the kids!). I systemically went through all the different tweaks that people saw varying success with in the forum. Last 2 on the list 1. changing out the linear rail brackets 2. the x y motors (don't think these are my issue). After breaking the belt tensioner I figured I may as well give the brackets a go considering I was going to have to dissemble the nextruder and reroute the belt anyway. Cheap enough parts. Gantry only ever had the tiniest misalignment (<1mm) but said I'd give it a go. Funnily changing the brackets seemed to have solved the worst of the resonance issues (yayyy!) but now I have this homing problem (boo). Resonance seems to have come back now today... could start a print with the homing issues, so loosened the belts to check the gantry squareness (all good), and re-tensioned the belts per the new process. Fit to cry. This printer is great when it works but I have spent more time trying to tweak it than Id say I have print hours put in at this stage.
Any recommendations on most probable cause would be most appreciated.
RE:
It's worth buying the accelerometer and running phase stepping calibration. That quieted down things a lot. Another thing to try is loosening the gantry bracket screws, manually move the gantry up and down in the Y direction a few times and then tighten it up again. That also made a difference.
Another issue I had been having is I kept losing belt tension which resulted in Y calibration failures and homing issues. My gantry is square (within reason, < 1mm). After removing the nextruder from the belt harness I noticed one of my belts had slipped as in the number of exposed teeth was 1 instead of 5 for the other belt. Once I corrected that and retention the belts my homing and Y axis calibration failures went away (so far).