I just installed the CR Touch kit on my Ender 3 Pro. Everything is wired up, but I can’t seem to get the Z-Axis offset correct. My process is:
Auto-Home
Step the Z-Axis down until there’s slight resistance on a sheet of paper between the nozzle and bed
Take that value (Roughly -1.3) and put it into the Z-Axis Offset value
Level bed
All of this works, but when the bed is leveling, the CR Touch needle is hitting the bed way earlier than the nozzle by maybe a few mm. When I go to print, there doesn’t seem to be adhesion in some places on the glass bed.
the CR Touch needle is hitting the bed way earlier than the nozzle by maybe a few mm
Have you noticed that the crtouch has an extendable probe? The probe should be lower than the nozzle when homing or leveling (so the nozzle doesn’t hit the bed) and higher than the nozzle otherwise (so the probe doesn’t hit your prints.)
I found that auto bed leveling worked poorly on my Ender 3 S1, because the Z axis was not well-adjusted enough to make fine movements without binding. I reassembled all the Z axis stuff, making sure the eccentric nuts were just loose enough to not support any weight. You want almost all the gantry weight supported by the the Z axis screw(s), because downward motion is gravity-driven. If the Z screws have to “pull down” on the ganty, then the Z movement will be too sloppy for bed leveling to work.
Yeah, this was my assumption (the probe should hit before) - I just wasn’t sure if they were supposed to offset just enough with the adjustable probe to end up being in-line with the nozzle. The instructions are… not great.
In addition to what has already been said, personally I use auto-home and then move the hot end to the middle of the bed (On my printer, after auto-home it is the ABL sensor that is in the middle of the bed) and then set the Z position to 0mm.
Then I go change the Z Offset setting until it touches the bed with the paper like you did.
In theory I suppose the result should be the same but it might be worth a try if what has been already suggested by u/p1mrx is not your problem.
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Have you noticed that the crtouch has an extendable probe? The probe should be lower than the nozzle when homing or leveling (so the nozzle doesn’t hit the bed) and higher than the nozzle otherwise (so the probe doesn’t hit your prints.)
I found that auto bed leveling worked poorly on my Ender 3 S1, because the Z axis was not well-adjusted enough to make fine movements without binding. I reassembled all the Z axis stuff, making sure the eccentric nuts were just loose enough to not support any weight. You want almost all the gantry weight supported by the the Z axis screw(s), because downward motion is gravity-driven. If the Z screws have to “pull down” on the ganty, then the Z movement will be too sloppy for bed leveling to work.
Yeah, this was my assumption (the probe should hit before) - I just wasn’t sure if they were supposed to offset just enough with the adjustable probe to end up being in-line with the nozzle. The instructions are… not great.
In addition to what has already been said, personally I use auto-home and then move the hot end to the middle of the bed (On my printer, after auto-home it is the ABL sensor that is in the middle of the bed) and then set the Z position to 0mm.
Then I go change the Z Offset setting until it touches the bed with the paper like you did.
In theory I suppose the result should be the same but it might be worth a try if what has been already suggested by u/p1mrx is not your problem.
Wait, sorry. What’s supposed to touch the bed? The hot end or the ABL sensor?