The screws between the bedplate and the brace… All 4 corners? Or just 3 spots?
Your graph makes it look like your bed is warped or twisted somehow. The front two mount points look pretty close to each other, but your back two corners are WAY off from each other.
Pull the PEI plate off and lay a straight edge across the plate, front->back, side->side, corner->corner. See if it wobbles or you can see daylight under it anywhere.
3 corners. In my defense when I cut the plate I was not at all understanding how to change the dxf in fusion. I’m starting to think it might be a good idea to cut a new one. I do have enough material left to get another bed plate. Not sure if I have enough to get a brace too. Hopefully it won’t need replaced as well
This isn’t right.
After physical leveling your three points should be at 0.04 or less, the rest can be all over the place but the three point have to be less than 0.04mm.
What is your starting gcode?
For this I was just running the bed visualizer which is set with G34 then G29
Wait I take that back it mus be 0.14mm or less, which seems really high to me. You three points meet that but somehow are all three negative.
You do show a 3mm dip in one corner, that should be visible.
Best I can figure is you have a 4.8mm twist and that is just too much for mesh leveling to fix?
That will not show twist. If you put two straight edges up there at the same time you would be able to see them being different.
Use caliper from your bed to Z mounting plate to your actual plate at each screw location.
Or, you can pull the bed off the mdf plate and put it top-side down on something flat. Twist should show up as a wobble in the plate.
It could still be that your umbilical is pulling the extruder mount in one corner and pushing it in another. Not sure how easy it’d be to see that even watching it from the side.
Waiting on new calipers to come from Amazon. Old pair didn’t like the fall from the LR3 table the other day. But I did just take the level and go along each of the 4 sides of the plate and I can see it on the x+y+ corner is low. Ok so what do I need to change to not have this problem with the next plate??
My bed support is 1/4" aluminum as well, not MDF. Could this be causing me issue??
I can pull the plate and take a pic of how it is if that will help
Shouldn’t be.
True
Are you sure there is nothing between the plate and the magnet? I can’t believe that backside is so twisted. Way more than I have ever seen.
This suggests you might be squishing your insulation. Ate your bed to plate screws in so far your insulation is touching the mounting plate? I am looking at that front bulge, two low corner touchpoints and a bulge in the middle as if something is pushing up.
Also, is your bed free to move on the mounting plate or do you have it rigidly mounted as the thermal expansion is buckling the bed?
That also actually explains why your 3 leveling points are negative. After physical leveling it rehomes Z and on yours the middle of your bed is about 0.1mm higher.
This could be. It was down on the insulation. I used the longest M3 screws i could find but i think they really need to be longer. And probably double up or get stiffer springs. This bed isnt light
I didnt have it pulled down super tight. But it still may have been too much. I dont think anywhere in town will have longer M3 screws so ill have to order some and give that a try. While im at it would stiffer springs be a good idea since this bed is so heavy?
Red arrow, the washer usually goes under the spring, so the plate is free to move and not get hung up on the spring.
The green arrows, is there some slop here or is that screw very rigid? You might want to oversize those holes so the metal has room to expand.
The green arrows is something I have never had to worry about. Thin wood plate, and thin metal bed. The thin bed wouldn’t move as much and the wood plate can’t rigidly constrain the bed even if it had too.
I took the plate off and put it on the kitchen table. Not precision flat by any means but it’s what I have lol. No wobble at all from any corner.
Just for S&G I put it on the kitchen scale
My washer and spring is just like yours in the picture
As far as the green arrow it did not have much room for movement due to it being pulled down on the insulation due to screw length…or lack there of
Three longer screws might just fix the issue. Your insulation should not touch the mount plate. That include the bulge from the wires which can casue a twist.
I used M3 screws. Is that the recommended size or should I step up to a M5? I will have to move the mounting hole away from the edge to do that but that’s not a huge deal. I have a new 310x310 PEI sheet here that I can install.
