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Nyloc bed leveling question  

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gnat
 gnat
(@gnat)
Noble Member
Nyloc bed leveling question

Re: https://github.com/PrusaOwners/prusaowners/wiki/Bed_Leveling_without_Wave_Springs

So I figured that I'd go ahead and do this (sans firmware tweak) since A) I have a bed level issue I need to address and B) I have my Y axis apart to replace bearings and improve the belt adjustment.

I'm a bit confused about the purpose of the nyloc nut vs nothing/smaller spacers/normal nuts. In skimming the instructions I figured that the final step would be to tighten them to the chassis and thus lock the bed in place. Now that I'm going over the directions in detail I don't see such a step and thus am wondering why the nyloc nuts are actually needed.

Is there a step missing or can someone clarify the use of the nuts for me?

MMU tips and troubleshooting
Posted : 21/04/2019 3:43 am
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(@)
Illustrious Member
Re: Nyloc bed leveling question

Gnat: My understanding is you tension up the screw/nylok nuts to the bed so the screws are secure, no play, but still turnable so the bed height can be adjusted by turning the screw. Friction to the bed is the ONLY thing that holds the screw/nut in place. All this tweaking is best done when the bed is hot, but when it cools it will shrink a bit, so personally I'd do the "tensioning" when the bed is cold.

ps: I used 0.004, 0.010, and 0.016 washers under the spacers to make my adjustments thinking I'd be safe over time. Turns out my bed is just as messed up today as before I did the detailed leveling, time and temp have "undone" my careful tweaks. I just use the 7x7 now and have given up on keeping the bed perfect.

Posted : 21/04/2019 3:51 am
gnat
 gnat
(@gnat)
Noble Member
Topic starter answered:
Re: Nyloc bed leveling question

Yeah I'm not going to shoot for super perfect. I'd just like to be able to use the entire bed rather than the center third... (rear is high and front is low). Like my Y belt, the factory adjustments don't seem to be helping at all 😕

MMU tips and troubleshooting
Posted : 21/04/2019 4:16 am
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(@)
Illustrious Member
Re: Nyloc bed leveling question

My left rear was very low, nearly a mm. Had to shim it up 0.016 inch to get it close. Right front is still high, even though I made all the other spots higher. Not sure what is going on there. But I tried the 7x7 bed level patch back in 3.4x and haven't looked back. Now using the 3.6x patch. One of these days I'll load Prusa's 3.7 and adjust my gcode. But for now my test patches look perfect in all quadrants. Sure, I can nit pick them, but they are fully usable as is and have never causes a bad first layer impression.

FYI: I tried using the four bed corrections. They do work, but 50um is a small adjustment compared to an error of -0.416 mm (my back left). 3.5 or 3.6 upped them to +/-0.100 mm. Still not enough to help me.

Posted : 21/04/2019 4:30 am
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