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).
RE: Another thread about homing issues but at my wits end
Thanks for you're reply. The phase stepping did lower some of my noise but the worst of it on the long straight x and y movements for perimeters on structured only quietened slightly. This is an older video but after the phase stepping calibration 82F3CDB9-8B07-4925-9485-20E396D4E401. That said this strangely isn't as bad now since I replaced the broken left tensioner and brackets. However I am getting resonance during general movement in random positions on the XY, mostly close to the outside sections. If I disable the motors, the extruder does get harder move by hand at the extremes of the XY and also causes vibrations on movement by hand. By the homing position, front right, its very bad. Almost feels like something is catching or restricting the belt movement. This might be my issue can't for the life of my see what's causing it unless my linear rail is the issue. But done think so as when the belts are loosened everything moves freely.
I've tried loosened the bracket screws as mentioned previously but didn't get much improvement, but I wouldn't if it may help here after I put things back together.
I mean once I get past the homing, I can't really flaw the prints. Seems like for a self assembly the tolerances are a little too tight to be reproducible for every build.
RE: Another thread about homing issues but at my wits end
Noticed that as well, perimeters are extra noisy. Could it be from one of the Y axis bearings? Or maybe the Y axis smooth rods are not parallel to each other? In my case I'm thinking of replacing the Y axis smooth rod bearings/bushings since they descended from an MK4 originally.