Beacon scan exposed waves in sheet/plate

So, this V-Core 3.1 300 started life as a standard V-Core 3 that was assembled by a guy who corners. I've taken it apart, rebuilt it, got some good use, then decided to go with Toolhead 1.0 and beacon. The printer has some resquaring needs, as it got jostled around as it got moved to its new printing area, but what I'm asking about are these ripples. They run along in bands from x=0 to x=300, in sequence along Y, with a strong dip near front. Any idea of what could have caused it? Each ripple by itself looks like +/- 0.02mm with a total bed deviation of .17mm, so not enough to be a problem Like, did the previous owner have the Lord Of All Build Plate Crashes that caused rippling in the magnetic sheet and gave the aluminum bed, or an extrusion, a slight bend? Or am I looking at not straight y rails that are causing flexing in travel? I have no idea at this point
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Solution:
If anyone stumbles on this: Consider this a lesson in buying cheap sheets of Amazon. Ripples went away after swapping the plate out, and this issue was never exposed until Beacon and being able to casually run a 25x25 grid :p
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5 Replies
OldKingHamlet
OldKingHamletOP4mo ago
Update: rotated the sheet 90 degrees and flipped it over. Ridges rotated 90 degrees and inversed. I guess this is just a cheaply made sheet 😐 I'll test with some other plates and close this out if that's the case.
No description
Solution
OldKingHamlet
OldKingHamlet4mo ago
If anyone stumbles on this: Consider this a lesson in buying cheap sheets of Amazon. Ripples went away after swapping the plate out, and this issue was never exposed until Beacon and being able to casually run a 25x25 grid :p
Chatterfang's printer
To me it looks like your rails are far too tight. I believe the ripples are at the distances between screws on your rails. They need to be just barely tight 1 to 2 NM, like just over the force you can apply without any leverage on the hex wrench.
OldKingHamlet
OldKingHamletOP3mo ago
It was the cheap sheet. I got a Rat Rig branded one from them, and the ripples are completely gone. Also, the waves would inverse if I turned the sheet over, or rotate with the sheet if I rotated it on the bed.
Jamorro
Jamorro3mo ago
GitHub
RatOS/site/docs/configuration/beacon_contact.md at documentation_v2...
The preconfigured Raspberry Pi image that makes it easy to run Klipper + Moonraker + Mainsail on your printer. - HelgeKeck/RatOS
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