Is Bed leveling not working for anyone else?

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wayne.kinne
Posts: 13
Joined: 29 May 2019, 14:15

Is Bed leveling not working for anyone else?

Post by wayne.kinne » 18 Jul 2019, 00:43

I have bed leveling on one of my other 3D printers and it works flawlessly, but on my B2X300 it always needs tweaking, one side is a little off and I have to play with the bed mounting screws to tune it in. Also nozzle height setting seems to be very picky, sometimes working but often being too tight or too lose and corrects never make sense. One time I need it so tight I almost rip the test sheet of paper, other times much looser.

Anyone else having these issues?

Tomorrow I will take a very close look at the arm that drops down, maybe it has some play in it???

DomingosRodrigues
Posts: 166
Joined: 12 Dec 2017, 11:44

Re: Is Bed leveling not working for anyone else?

Post by DomingosRodrigues » 18 Jul 2019, 17:07

Hello Waine,

I've had some similar problems with the leveling and it turned out to be a lack of squareness between the axis, especially the Y axis whose rods were slightly higher on one side than the other causing the whole printer to missread the bed. Try losening all rod holders from the frame and from the rod, move the axis using the LCD, then slowly tighten it moving the axis between tightenings. Also my mid section Y reinforcement (its in the midle of the Y axis, bellow the X axis where two frame parts cross), wasn't correctly slotted and was slightly bowing the bottom structure.

Not sure about this but I feel the leveling improved somewhat when I placed a thick rubber mat bellow the printer.

As for the Nozzle height, first of all ensure you autoleveling probe body and X carriage are solid and have no play, and that it's wire are in no way being stretched of tensioned, otherwise the height measurements will be off from point to point. The arm has some play due to the internal gearing of the servomotor, but as it is pre-tensioned on the oposite direction it will receive force when measuring there should be no backlash, nonetheless check if the screw that holds the arm in place is well tightened.
The menu option "Nozzle height" it is only meant to be used when you move the printer from one place to another or make any major alteration to it. Other than that you should fine tune the first layer while printing using live nozzle height feature ( Chapter 6.1 of the user manual available here: https://beeverycreative.com/wp-content/ ... 190201.pdf ), I only adjust a max of 0.05mm between prints and most of the times when using the same material I don't even change it :)

Best regards
Domingos Rodrigues

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johan.eklund
Posts: 2
Joined: 16 Aug 2019, 10:19

Re: Is Bed leveling not working for anyone else?

Post by johan.eklund » 16 Aug 2019, 10:23

No, it does not work. It performes the meassuring, but does nothing if the bed is not level. So the bed must be leveled manualy.

DomingosRodrigues
Posts: 166
Joined: 12 Dec 2017, 11:44

Re: Is Bed leveling not working for anyone else?

Post by DomingosRodrigues » 19 Aug 2019, 11:51

Hello Johan,

Can you please confirm that you are using the latest version of the printer's firmware and printing profiles, there was a bug on the original firmware/ profiles that prevented calibration from being applied.

On the following versions leveling does work and the Z axis can be seen working to compensate the bed curvature. But the auto calibration Cannot compensate for assembly errors that cause the axis not to be orthogonal between themselves, this would cause the measured mesh to be incorrect thus making the leveling incorret, most of these assembly errors happen on the Y axis as one of the rods is higher than the others causing the bed to raise/lower close to the edges.

If you have any other question about the printer please contact customer_service@beeverycreative.com with some photos, videos and gcodes that cause the problem you are having so we can help you solve it :)

Best regards
Domingos Rodrigues

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win456
Posts: 1
Joined: 23 Aug 2019, 16:48

Re: Is Bed leveling not working for anyone else?

Post by win456 » 23 Aug 2019, 16:57

DomingosRodrigues wrote:
18 Jul 2019, 17:07
Hello Waine,

I've had some similar problems with the leveling and it turned out to be a lack of squareness between the axis, especially the Y axis whose rods were slightly higher on one side than the other causing the whole printer to missread the bed. Try losening all rod holders from the frame and from the rod, move the axis using the LCD, then slowly tighten it moving the axis between tightenings. Also my mid section Y reinforcement (its in the midle of the Y axis, bellow the X axis where two frame parts cross), wasn't correctly slotted and was slightly bowing the bottom structure.

Not sure about this but I feel the leveling improved somewhat when I placed a thick rubber mat bellow the printer.

As for the Nozzle height, first of all ensure you autoleveling probe body and X carriage are solid and have no play, and that it's wire are in no way being stretched of tensioned, otherwise the height measurements will be off from point to point. The arm has some play due to the internal gearing of the servomotor, but as it is pre-tensioned on the oposite direction it will receive force when measuring there should be no backlash, nonetheless check if the screw that holds the arm in place is well tightened.
The menu option "Nozzle height" it is only meant to be used when you move the printer from one place to another or make any major alteration to it. Other than that you should fine tune the first layer while printing using live nozzle height feature ( Chapter 6.1 of the user manual available here: https://beeverycreative.com/wp-content/ ... 190201.pdf ), I only adjust a max of 0.05mm between prints and most of the times when using the same material I don't even change it :)

Best regards
Domingos Rodrigues
Thanks for you suggestion Domingos. I also had a similar problem and it really helped me out.

MaxPower
Posts: 10
Joined: 11 Dec 2019, 20:59

Re: Is Bed leveling not working for anyone else?

Post by MaxPower » 15 Dec 2019, 19:17

Hello,

I have the problem that mo matter what I try the nozzle is too close on the right side and too far on the left. I tried noumerous ajustments of the Y axis rods, the X axis rods were square from the beginning and both Z sides are on the same height. The Bed itself is leveled as best as I can (all with calipers).
I have the feeling that mesh bed leveling itself works since however I correct everything it seems to print as crooked as before. Is there any way to calibrate mesh bed leveling?
Another thing that puzzles me: As far as I understood mesh bed leveling is supposed to measure where the bed is and correct for any misalignments. So however crooked the build platform is, as far as it is crooked in the same way when printing as it was when measuring it should print correctly since the software corrects for that. So why is the alignment of the axes such a factor?

Max

DomingosRodrigues
Posts: 166
Joined: 12 Dec 2017, 11:44

Re: Is Bed leveling not working for anyone else?

Post by DomingosRodrigues » 17 Dec 2019, 12:32

Hello Max,

The autocalibration module measure and corrects the bed curvature but as it does not measure exactly in the same XY where the nozzle is if there is a lack of squareness between the X and Y planes the measured plane will have a slight mismatch with the place the nozzle is printing.

Usually the problem comes from the Y rods that aren't properly installed (slightly higher or lower on one of the side or back and front)and/or
incorrectly tightened causing them to arch in the middle.
Also it can be caused by the X axis plastic parts that hold the X rods not being tight enough allowing it some give.
Tighten all the frame screws quite tightly to improve squareness of the base structure and place the printer on a flat surface, usually a large stone slab or a glass table are best as they are extremely flat, this shows the curvature that the frame might have due to assembly.
Lastly ensure you bed calibration probe is rigid relative to the extruder as it is loose the measurement will be incorrect as well.

Since the first layer is only 0.3mm hight even a small misalignment can cause a greatly visible deviation.

Best regards
Domingos Rodrigues

MaxPower
Posts: 10
Joined: 11 Dec 2019, 20:59

Re: Is Bed leveling not working for anyone else?

Post by MaxPower » 26 Dec 2019, 23:31

Hello Domingos,

To quote a famous song "I tried so hard and got so far but in the end it doesn't even matter".
Well, jokes aside, I basically tried everything you wrote. I even loosened all frame screws (which were reachable) and improved the squareness of the frame because I realized that when lifting it a bit it would first lift off on two opposing corners. This was fixed by that. Next I realized that the bed was able to wiggle a tiny bit because I took the tip "don't overtighten the U clamps" a bit too serious. So I took the bed apart and fixed that. The calibration sensor is not loose.
After all that I have absolutely no improvement. Not even a different pattern of "to close" and "to far". The nozzle is too tight or too far from to the bed in exactly the same locations as before even after basically changing the whole geometry of the frame.
So I still have the problem that mesh bed leveling in itself is working flawlessly as in it corrects for everything I do. But sadly it corrects it wrong. I even tried lifting one side of the Y-axis up intentionally to check if this would finally produce another result. But it was still the same.

I'm completely out of ideas what could cause this besides a software issue (which I also think is implausible). The autocalibration hardware is defenitly fine.
I guess the next thing i would try is to deactivate mesh bed leveling, level the bed by hand and look if this works.

Kind regards,
Max

BMA3D
Posts: 1
Joined: 10 Mar 2020, 12:02

Re: Is Bed leveling not working for anyone else?

Post by BMA3D » 10 Mar 2020, 12:11

I have the exact same problem, any ideas?!

MaxPower
Posts: 10
Joined: 11 Dec 2019, 20:59

Re: Is Bed leveling not working for anyone else?

Post by MaxPower » 21 Mar 2020, 16:10

Hello,

I deactivated mesh bed leveling, leveled the bed by hand and got better results. Not awesome nor consistant results but at least I am able to print now. If anyone has got more ideas I would really appreciate it.

Max

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