Bed Level Correction Limitation -50 Microns; I need -80 Microns
 

Bed Level Correction Limitation -50 Microns; I need -80 Microns  

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todd.m4
(@todd-m4)
Active Member

Hello to All,

I’m very new to the 3D Printing World and have struggled with First Layer Calibration and Bed Leveling from the receipt of my Original Prusa i3 MK2 printer a month ago.

The Problem:
The print bed is not flat. The backside needs to be adjusted so the nozzle is closer than -50 microns. To overcome the -50 microns firmware limitation, I adjust the g-Code Starting Script as follows: G80 L0 R9 F12 B-80. Once the g-code starting script was modified, I reset the firmware Bed Level Correction to all zeros (i.e., Left 0 Right 0 Front 0 Back 0). The reason I reset the Bed Level Correction settings to zero was, I thought the g-code starting script would make the necessary adjustments in place of the firmware. However, when I ran the starting script, mesh bed leveling ran normal but there was no indication of the parameters associated with G80 (e.g., L0 R9 F12 B-80) being executed. In review of my starting script, I don’t see anything that may cancel-out the G80 parameters. Currently, the only way I can adjust for bed leveling is to use the firmware Bed Level Correction that limits me to -50 microns. However, I need -70 to -80 microns for the backside of my print bed.

Additional Details:
After performing the XYZ Calibration and reset many times, I went through my printer ensuring all the screws and nuts were tight, rods were seated and flush, zip ties secured, everything is aligned, etc. followed by more XYZ calibrations to no avail.

1. What am I doing wrong?
2. When I modify my g-code starting script with G80 L0 R9 F12 B-80, should I reset the firmware Bed Level Correcting settings to zero? This is what I did but the g-code G80 parameters didn’t execute…it was as though I had done nothing.
3. Why can’t I get the g-code starting script (e.g., G80 L0 R9 F12 B-80) to run? My current Starting Script is as follows:

M115 U3.0.7 ; tell the printer latest firmware version available
G28 W ; home all without mesh bed level

G80 L0 R9 F12 B-80 ; mesh bed leveling
G1 Y-3.0 F1000.0 ; go outside printing area
G1 X60.0 E9.0 F1000.0 ; intro line
G1 X100.0 E12.5 F1000.0 ; intro line

4. If the PINDA Probe is responsible for Auto Leveling the print bed, is my PINDA Probe defective since I need to manual adjust the bed level?
5. Any thoughts that may help?

Any and all help is sincerely appreciated. Thank you!!!

Posted : 05/05/2017 7:04 am
joan.t
(@joantabb)
Veteran Member Moderator

Can you put a washer between the heat bed and the Y axis platform, making it slightly higher? then you would need less adjustment.

regards Joan

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK...
Posted : 05/05/2017 12:44 pm
JeffJordan
(@jeffjordan)
Member Moderator

@todd: you got a pm.

dem inscheniör is' nix zu schwör......
Posted : 05/05/2017 12:58 pm
richard.l
(@richard-l)
Member Moderator

3. Why can’t I get the g-code starting script (e.g., G80 L0 R9 F12 B-80) to run? My current Starting Script is as follows:

M115 U3.0.7 ; tell the printer latest firmware version available
G28 W ; home all without mesh bed level

G80 L0 R9 F12 B-80 ; mesh bed leveling
G1 Y-3.0 F1000.0 ; go outside printing area
G1 X60.0 E9.0 F1000.0 ; intro line
G1 X100.0 E12.5 F1000.0 ; intro line

Try this instead...

G28 W
G80
M80 L0 R9 F12 B-80
G1 Y-3.0 F1000.0
G1 X60.0 E9.0 F1000.0
G1 X100.0 E12.5 F1000.0

...
Posted : 05/05/2017 5:52 pm
kevin.r5
(@kevin-r5)
Estimable Member

Check out this video "Building tips for Original Prusa i3 3D printer"
Here:
At 2:22 into the video he indicates the problem your having might be caused by a twisted Y-axis.
May not help you, but worth a look.

-Kevin...
Posted : 06/05/2017 1:09 am
todd.m4
(@todd-m4)
Active Member

I would like to thank each of you for your time and input to my issue. I am happy to report, your help resolved my bed leveling issues and my printer is printing better than ever.

I truly hope my quest for knowledge will one day be of value to others where I can provide input to issues and help those who are struggling, as I have been, to feel victory when their printer is operating at it's best. Until then, Please know how invaluable your shared knowledge is and how much I appreciate your help.

Sincerely,

Todd

Posted : 07/05/2017 9:51 am
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