Bed Mesh Just Keeps Getting Worse

After remounting and straightening everything I can think of, it seems like I'm only making things worse. I started out with a 0.4-ish range, and now I'm looking at over 0.9. What am I doing wrong? Here's what I currently have, unheated and heated (60°C), respectively.
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96 Replies
harsh-harlequin
harsh-harlequin2y ago
enclosed or open and have you used this guide?
harsh-harlequin
harsh-harlequin2y ago
3D Printers & a Whiteboard
YouTube
RatRig V-Core 3: How to Get a Square Frame
This video is for those who struggle getting bed meshed with their RatRig V-Core 3. Please feel free to jump to the chapter you are interested in. 0:00 Intro 1:05 about the v-core 3 frame and bed leveling 8:26 what to take care of in the building phase 9:17 the right square 10:09 build tips 16:50 adjusting the frame according to your bed mesh ...
FRINGE_SCIENCE#4673
I thought I had, which is why I went through everything and made it straight.
FRINGE_SCIENCE#4673
He said the problems may lie in the gantry being too tight. He suggested using only 7 screws, so I removed every other one, starting from the middle.
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FRINGE_SCIENCE#4673
This is what I got.
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harsh-harlequin
harsh-harlequin2y ago
gantry def looks like it has some bowing but i dont think thats the issue.
harsh-harlequin
harsh-harlequin2y ago
step 16, does yours measure out 220mm at the rear on both sides?
FRINGE_SCIENCE#4673
It looks like it's... 220 on the front and... 221 on the back.
harsh-harlequin
harsh-harlequin2y ago
id start by getting the rear where it should be then adjust the fronts based off what the bed mesh tells you. you are doing a ztilt between adjustments right?
FRINGE_SCIENCE#4673
I just did. Now I'm running the heightmap again.
FRINGE_SCIENCE#4673
Okay, we've had... A change.
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harsh-harlequin
harsh-harlequin2y ago
Based off the video the front left if your looking at the machine needs to come up.
FRINGE_SCIENCE#4673
So where the red is isn't the front?
harsh-harlequin
harsh-harlequin2y ago
Red should be front, i know it seems counter productive but he explains how moving one side up or down will effect the other corner When adjusting mine I used a block i was able to screw into the 3030 to know where i started and adjusted from there inserting different thickness items in then pushing or pulling the 3030 tight to the spacer.
FRINGE_SCIENCE#4673
I lifted the front left by a hair. Did the z-tilt and got this.
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harsh-harlequin
harsh-harlequin2y ago
min went from .945 to .860 so its going the right direction, id do it again and give it 2 hairs.
FRINGE_SCIENCE#4673
What do I do about the back? How much should I care about the measurement staying at 220mm?
harsh-harlequin
harsh-harlequin2y ago
In a perfect world if there all 220mm it should be perfectly square, mine by no means are 220 all the way around i just gave the machine what it wanted by adjusting the front after getting the back even. I hover ~0.260mm deviation and thats good enough for me.
FRINGE_SCIENCE#4673
Alright. I'll see what happens.
FRINGE_SCIENCE#4673
The results.
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FRINGE_SCIENCE#4673
Are we sure the red hump is the front? The 0 point of the Y axis starts there, but that doesn't make sense for where the X's 0 is.
harsh-harlequin
harsh-harlequin2y ago
Im about 99% sure it is and your getting closer to flat off the changes
FRINGE_SCIENCE#4673
The z-tilt calibration suddenly started grinding. X-axis is now grinding.
harsh-harlequin
harsh-harlequin2y ago
and yes your x gantry is hella bowed what do you mean by grinding?
FRINGE_SCIENCE#4673
Stuttering, making a grinding noise, not moving enough. I think the tilting is causing this.
harsh-harlequin
harsh-harlequin2y ago
With the machine off see if the x and y axis move freely
FRINGE_SCIENCE#4673
Alright, something changed. In the back right motor, the belts are moving up and down, slipping off the bearings and getting pinched on the edges.
harsh-harlequin
harsh-harlequin2y ago
Moving the idler pulley location slightly probably moved where the belt wants to ride, get it back to riding in the middle.
FRINGE_SCIENCE#4673
I'm opening the motor mount.
harsh-harlequin
harsh-harlequin2y ago
you should have enough room to loosen the grub screws and move it a lil without pulling it all apart.
FRINGE_SCIENCE#4673
Should. I didn't pull the whole thing apart. I tried moving the gear, and it seems to have done nothing. The lower belt still wants to go up and down as it moves. I can't imagine what's doing that... Unless the belt is bad.
harsh-harlequin
harsh-harlequin2y ago
mine goes up and down slightly but it stays within the toothed pulley face, if yours has so much variation it can't stay on track might be time for a new belt.
FRINGE_SCIENCE#4673
Great... It's all but brand new.
harsh-harlequin
harsh-harlequin2y ago
Belt's still properly tensioned? and can you get a video showing how much movement it has?
FRINGE_SCIENCE#4673
It was. Gimme a minute.
FRINGE_SCIENCE#4673
This thing is jammed right up.
harsh-harlequin
harsh-harlequin2y ago
In that one spot it goes from the top down to the bottom in like 1 revolution of the motor, how do all the rest of the pullies look?
FRINGE_SCIENCE#4673
Alright. Don't really change.
harsh-harlequin
harsh-harlequin2y ago
hmm id start pulling the motor plate apart and see if you find anything funky, hopefully we can get some other input in here but i dont wanna start tagging people all willy nilly. Took this from another person who was having belt walk issues "the only logic for any belt to walk up/dn on a pulley is the either the angle of the pulley pivot axis is not perfectly perpendicular to the belt, or the next traverse point of the belt travel is not parallel and in the same plane as that pulley. EG: it you feed the belt off angle to the pulley it will walk in that direction."
FRINGE_SCIENCE#4673
So the belt probably isn't bad, it's all the funky angles I've introduced to this thing. That would make sense as to why it's suddenly happening.
harsh-harlequin
harsh-harlequin2y ago
Yeah don't assume its bad just yet, based off your last mesh it looks like both front's need to go up. Bring both of them up some and move the machine by hand first to make sure it doesn't bind up before meshing
FRINGE_SCIENCE#4673
Why can't the Z gantries adjust for it? I thought that was the point of having a 3-point z-mount.
harsh-harlequin
harsh-harlequin2y ago
it can only do so much, and as long as your bed isn't bent i see no problem getting it flat enough. Also after you get it back to functioning and moving without binding, id loosen the xy joiners and retighten them since things have moved around and see if that helps flatten your x gantry.
FRINGE_SCIENCE#4673
I doubt it's bent. I used a straight edge and level, it's fine on all measures. And the joiners? You mean the plates on the framework?
harsh-harlequin
harsh-harlequin2y ago
yeah those plates but dont worry about those until you get the belts staying where they should
FRINGE_SCIENCE#4673
Alright. I'll put the old belt back.
harsh-harlequin
harsh-harlequin2y ago
You get it back together?
absent-sapphire
absent-sapphire2y ago
X gantry 100%, just took down my extrusionless mod on my 300 because of the shape of mesh(same as yours) and 0.7 variance
michaelaswood
michaelaswood2y ago
Hi, I had this same issue. I ended up putting a micro shim on the Aluminium block where the high point on your heightmap show (Yours looks roughly in the middle and then went from there. I guess I had a slightly bent runner, even though I made sure all the Alu blocks were the same height and tightened the same.
FRINGE_SCIENCE#4673
Well, here we go again.
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FRINGE_SCIENCE#4673
What would you suggest I do now? @kermit.sudoku , any suggestions?
harsh-harlequin
harsh-harlequin2y ago
What all have you changed?
FRINGE_SCIENCE#4673
I filed down the mounts on the X rail so they fit flush within the blocks, and realigned the Y rails. I've also tried adjusting the Y frames back and forth.
harsh-harlequin
harsh-harlequin2y ago
To me it still looks like your front left needs to come up but you do still have some x gantry bowing. I know it seems counter productive but I followed the video and made those adjustments and got mine to under 0.2mm deviation
FRINGE_SCIENCE#4673
The heck did that?
harsh-harlequin
harsh-harlequin2y ago
What?
FRINGE_SCIENCE#4673
That random spike in the middle.
FRINGE_SCIENCE#4673
It was a fluke. Here's the latest.
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harsh-harlequin
harsh-harlequin2y ago
Oooh okay yeah id keep repeating and bringing up the front left corner a little at a time.
FRINGE_SCIENCE#4673
I'm getting there.
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harsh-harlequin
harsh-harlequin2y ago
What happened lol
FRINGE_SCIENCE#4673
I think I overcompensated.
harsh-harlequin
harsh-harlequin2y ago
Just a smidge
FRINGE_SCIENCE#4673
Getting there.
FRINGE_SCIENCE#4673
Ooh, something is happening. @kermit.sudoku what do I do now? It's getting close.
harsh-harlequin
harsh-harlequin2y ago
leftside looks pretty even so id start working the right front up a little at a time
harsh-harlequin
harsh-harlequin2y ago
Not terrible now, if it was me id bring both fronts up an equal amount. One thing i also did is after i got it fairly flat was loosen then tighten the back of the y rail to relieve any stress that it was under from shifting the front around
harsh-harlequin
harsh-harlequin2y ago
Got some pretty nasty x gantry bowing, id loosen and retighten your xy joiners where they attach to the xy joiner plates and see if that helps the curve out any
FRINGE_SCIENCE#4673
I tried removing the 4 anchor screws on the sides of the mounting blocks. That did nothing.
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FRINGE_SCIENCE#4673
Then I loosened and flipped the blocks in between the rails so that they just slid in between smoothly. That did a lot.
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FRINGE_SCIENCE#4673
I don't think this is trustworthy. Running it again.
FRINGE_SCIENCE#4673
I've made... a difference.
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harsh-harlequin
harsh-harlequin2y ago
slide the scale z max back all the way to the right like it has been before sub 400 deviation is definitely a step in the right direction and most would be happy with that, the mesh looks ugly tho
FRINGE_SCIENCE#4673
Like that?
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FRINGE_SCIENCE#4673
I tried loosening the whole rail and got this.
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harsh-harlequin
harsh-harlequin2y ago
yeah makes the mesh look less jagged and can see whats going on, looks like loosening it let the rail bow up. i would say tighten it back how it was working from one side to the other. also how perfect are you going for? most people are happy with sub 0.4mm deviation on a 500
FRINGE_SCIENCE#4673
Tightened it back down, and seems to have done nothing. Well, nothing good.
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FRINGE_SCIENCE#4673
I fixe it! I got rid of the hump!
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FRINGE_SCIENCE#4673
I switched the top rail with the bottom and turned one around. That got rid of that stupid middle peak!
FRINGE_SCIENCE#4673
That is the best I have been able to get it thus far.
harsh-harlequin
harsh-harlequin2y ago
Hell yeah you'll never get it perfect but that is alot better than most strive for.
FRINGE_SCIENCE#4673
So in the range of .2 and generally flat is the goal.
harsh-harlequin
harsh-harlequin2y ago
okay also prolly wanna heatsoak it and see how much it changes as well
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