Nylon nut leveling  

RE: Nylon nut leveling

Posted by: @th3radman

I was having some bed leveling issues with the spacers, so I tried the nyloc nut mod with the bed visualizer plugin for octoprint.  However I'm having a hell of a time leveling my bed using the plugin.  I'm not sure if it's me or the software, but it seems impossible to get a decent level.  I have the center point at the center of the bed with that as the reference point, but when I adjust the bed, nothing, or the opposite of what I needed to do usually occurs.  For example, if one side of the visualizer says the bed is to high, so I tighten the bolt, it makes it worse.  That makes me think the graph is flipped, but I would assume the (-100, -100) corner would be the (0, 0) before I adjusted the reference point.  Am I just looking at the whole thing backwards? considering the (-100, -100) is the home corner.

This is the visualizer I'm using here. This is what I would have used from a youtube video, but I keep getting a pip error and don't know how to fix it here.

G code used

G80 %Mesh bed leveling
@BEDLEVELVISUALIZER
G81 %Output result
G1 Z20 % Move position
G1 Y 200 %Move position
M84 %Disable steppers

Hi,

which pip error do you get, maybe I can help 🙂

RE: Nylon nut leveling

Yes it is true that some bed leveling visualizer's show a mirrored image.
The best tools are an Octoprint plugin "Prusa Mesh Leveling" and the web-page "g81_relative".
"g81_relative" gives you info on how to adjust the 8 screws around the edge of the bed.
"g81_relative" can be found here: https://pcboy.github.io/g81_relative/

RE: Nylon nut leveling

Everyone using the PINDA must remember the damn thing is temperature sensitive.  From run to run if the PINDA changes temperature you will chase your tail in circles trying to get things set.

Do any bed leveling tweaks with the bed COLD.  Yes, it will change as the bed warms up, but hopefully in a way that is small enough the PINDA and mesh level will compensate (not guaranteed).

RE: Nylon nut leveling

Also you could reduce PINDA variations by adding gcode to warmup the probe to a certain temperature before mesh leveling. It‘s been discussed in the forum before...

RE: Nylon nut leveling

Sorry chaps yet another noob question.

I thought the whole point of auto bed leveling ala Prusa was so that the bed did not need to be level because software would adjust Z height to allow for non level/flat?

RE: Nylon nut leveling

Posted by: @towlerg

I thought the whole point of auto bed leveling ala Prusa was so that the bed did not need to be level because software would adjust Z height to allow for non level/flat?

For the most part, that is true. The mesh bed leveling process will compensate for a certain degree of bed unevenness. The implementation of the 7x7 mesh bed leveling feature significantly improved this capability. A lot of people like to pursue flat bed perfection, but even having done this, once you remove and replace the spring steel sheet, a lot goes out the window. I'm using Octoprint with the Prusa leveling plugin and can watch the shape of the bed change over time, yet I'm able to get a 5x5 grid to print smoothly over the entire bed surface. If the bed is significantly warped, it's worth trying to physically correct it. Otherwise, most folks won't see a significant benefit. It's harmless, done correctly.