Bed levelling - just z probe, or 2 indep. motors with G32?
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think I may have found the problem - the 'S' in the last G30 must be S4; as there are 4 screws, not 3....
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@fcwilt The P is for the thread pitch ....
I got this: Error: Number of calibration factors (4) not equal to number of leadscrews (3)
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@Reefwarrior said in Bed levelling - just z probe, or 2 indep. motors with G32?:
@fcwilt The P is for the thread pitch ....
I got this: Error: Number of calibration factors (4) not equal to number of leadscrews (3)
Arggggg.....
My bad - I confused the S and P parameters.
When am I going to learn to not trust to memory....
Frederick
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@fcwilt hahahaha no stress
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Can't seem to sort out the 'Number of calibration factors....' error.....
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Eureka!
G32
Manual corrections required: 0.00 turn up (0.00mm) 0.00 turn down (0.00mm) 0.76 turn up (-0.38mm) 0.81 turn up (-0.41mm)The M671 I used to define the springs positions was not correct.
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@Reefwarrior said in Bed levelling - just z probe, or 2 indep. motors with G32?:
Eureka!
G32
Manual corrections required: 0.00 turn up (0.00mm) 0.00 turn down (0.00mm) 0.76 turn up (-0.38mm) 0.81 turn up (-0.41mm)The M671 I used to define the springs positions was not correct.
The : character after the X and Y?
Frederick
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@Reefwarrior said in Bed levelling - just z probe, or 2 indep. motors with G32?:
This setup is basically on an Ender3 with a DuetWifi.
I wouldn't bother changing the Ender3 to a dual Z axis setup. It's not necessary. When assembled properly the design is adequate for keeping the X gantry level. The bed can be manually leveled pretty easily, and mesh compensation can take care of the rest.
There's something to be said for simplicity. Once you add a second Z axis motor you have to calibrate it because it won't stay in sync over time.
Also, 2 Z motors will only give you tilt correction along a single axis. You need 3 motors to do a 3 point plane. So you'd still be using mesh compensation and manual leveling anyway.
So I say avoid a second z axis motor if the printer design allows for it.
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@Phaedrux Hi, thank you for the reply. I have extended my Z and my X axis and noticed drooping on the one side if the Z raises... hence the reason now for the second motor
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@Phaedrux I'm probably going too complicated now, but won't it help to have 2 indep. motors, have it correct tilt and then bed level assistant for the rest? If I read it correctly, I can not have both 2 indep and MBLA at the same time, or have I misunderstood something?
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@Reefwarrior said in Bed levelling - just z probe, or 2 indep. motors with G32?:
If I read it correctly, I can not have both 2 indep and MBLA at the same time, or have I misunderstood something?
Yes you can use both, but there needs to be a reference somewhere. If you do the tilt correction based on the bed surface, but then change the bed surface itself with MBLA your tilt correction is now changed as well.
Maybe a better solution would be to correct for gantry tilt with 2 endstops at the top of the frame so that you're leveled to the frame as a reference. Then you can adjust the plane of the bed to match the frame.
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@Phaedrux Awesome, thanx!
