I was levelling the bed of my Franken-ender (Ender 3v2) printer and it just stopped work right. Today it turns on but when I homed the printer it is offset to the right side. The front left corner spot is in the front middle now. It drives over to the right side hitting the edge with the usually stepper scream. Front to back seems OK.
Any ideas on this.
What firmware do you have on it currently? It is possible that the BLTouch offsets may have reset in which case you should be able to set them back to what you need.
Jyers UI.
I don’t think it is the firmware and there is a function built in to set the home position. I don’t remember if the home, when a probe is used, is in the normal place or the centre of the bed.
I did just install linear rails for the Z axis and I think the problem has to do with getting them aligned to each other and the gantry. If I move the gantry up, under power, if will stop and the steeper groans until I give it a nudge to get it moving again and again and again.
Hmm ok, did you print the linear rail centering guides? These help to make sure the rail is perfectly centered on the extrusion. Something like this: Printables
The other thing you might want to check is to make sure your stepper motors are getting enough current. You can up the amount of current they are getting using the potentiometer on the board. Try centering the rails first if you haven’t though!
How to Adjust VREF / Stepper Motor Current on Ender 3 (Pro/V2) – YouMakeTech.
I did use those but when I loosened off all the mounting screws it helped a lot so I think there was still some misalignment and letting the rails float helped. Another thing it might be is that I put Oldman couplings on the gantry. They are suppose to help eliminate ringing. The one on the right floats around nicely but the one on the left can’t because the leadscrew is fixed top and bottom and I’m thinking maybe it is bound up tight and is stopping the stepper from moving.
After taking many parts off I have found that the z axis leadscrew runs at a slight angle vertically. There doesn’t seem to be any way to adjust this since both the stepper and the gantry leadscrew mounting are both on the vertical structural piece. I can’t move the stepper closer or the gantry screw mount farther away. Probably this doesn’t matter on a stock printer since the shaft can bend some but I have a belt drive double leadscrew setup where the top is held in a block. This block forces the leadscrew to bend considerably to get it mounted, hence the binding problem. I think with the wheels used before there was some give that allowed it to work, with some groaning that I previously didn’t know the source of but linear rails seem to be a lot less forgiving. One possible cludge of a fix would be to machine the block so that it fits without bending the screw.
Any ideas on this.
I solved the leadscrew alignment with less drastic measures but it still jams when moving up. If I disconnect the coupling between the stepper and the leadscrew the stepper rotates fine and the gantry moves fine if I rotate the leadscrew but they won’t work together. I never had this problem before and the only change is the z axis rails and I checked to make sure they are parallel and the gantry was level with the top. beam.
I got nothing now…
OK so it is working OK-ish now, it binds some at the top but I can move it up and down smoothly now. I think it just comes down to everything must be adjusted just right, in relation to everything else and that can be a bitch. It dose run smooth and quiet compared to wheels.
Have you checked the squareness of your frame as well? Doesn’t matter how square you get the rails and rods to the frame if the frame is not square to begin with. I will usually loosen the bar that holds the z-axis extrusions together and then move the x-axis all the way to the top and re-tighten it, then move it up and down and see if there is any binding at all. Usually if you tighten it while the axis is at the top it works pretty well.
Did that first thing. It prints OK now, mostly but now the bed levelling is out of wack. The more I adjust it the worse it gets. Maybe something is flexing to much???
Hmm, did you re-level the bed by hand? The BLTouch still has to work within certain tolerances, if the bed is too far out of wack it can cause issues.
I did but I guess it doesn’t mean I got it right. When I run the bed level routine it moves from corner to corner. When I repeat the touch levelling over and over at the same corner the results is higher by .03mm to .05mm each time and just keeps going. I don’t think it is the CR touch itself. Can the bed flex enough to cause this.
Yes that is certainly odd, not sure what could be causing that…
Maybe try re-flashing the firmware?
Thanks, but the printer has passed away. Life is cruel.