New V-Core 3.1 500 Out of Square?
Well I thought I had built in square (I should have bought a bigger engineering square), but after running several bed mesh calibrations (before seeing the Square Mesh video and realizing I should have measured before adding the heater and top), it seems I am probably out of square . If I understand the video properly I need to raise the B corner, but it looks like more than that is going on here. Any opinions on what I need to adjust?
11 Replies
deep-jade•15mo ago
No expert here so you may not want to listen to me :P. You seem to have about 0.53 variance right? A lower corner on the mesh means that the probe had to travel more to trigger, so that corner is too high. You would need that corner down. If that is not possible you could bring the other 3 corners up. If you want to move either C or D, don't forget to loosen the electronics panel corner mounts as well as the outside corner bolts.
0.53 variance is a really good starting point... If that's your first mesh, you did a great job with your build. You are correct, you need to raise b (lower a).
What the mesh is telling you is that you have some counter-clockwise twist in the frame when looking front to back... You'll want to 'twist' the front in the same direction to square things up - thus raising b & lowering a...
Just be sure to run a z-tilt before your next mesh to see if you made any improvement
other-emerald•15mo ago
Thanks, it wasnt my first mesh, but only because I ran it 5 times at different bed temperatures and flipping the build surface to make sure that wasnt the problem, but they all came out about the same. Very glad to hear that a .53 variance is a good start 🙂
Any hints on how much I want to raise the b? Is it 0.25 mm, which seems less than I can measure?
Any hints on how much I want to raise the b? Is it 0.25 mm, which seems less than I can measure?
For a 500 bed, anything below 0.4 is good... Below 0.3 is excellent
other-emerald•15mo ago
Well, that did not go as I had hoped, I actually went from 0.53 variance to 0.743 variance although with less twist and A & B being closer, so I got out my trusty 6 foot straight edge and discovered that the bed itself definitely has a dip in the C corner and is relatively flat across a<->b, b<->d and a<->d. In addition, my digital angle reader from my table saw says that all of my angles are within 0.1 of 90 degrees with most right on the money now. So the question is, how do I fix that one corner of my bed?
Not much you can do if the bed isn't as flat as you'd like... Other than maybe try to shim... Are you measuring the bed itself or the spring steel on top?
other-emerald•15mo ago
I had already installed the magnetic rubber, so I am measuring the spring steel, and separately the on top of the rubber. I had tried flipping the spring steel and got the same measurement. I also tried measuring the thickness of each corner and they look the same, although that was with mechanical calipers that were in my shop. I will get my digital calipers and confirm the readings.
Sometimes the mag sheet isn't the flattest... If that's the case, you can easily shim a bit in that corner... But, honestly, do you really need to? That's a half mm variation over 500mm... Do you need to print parts that large with greater precision?
deep-jade•15mo ago
What is the problem with bringing A, B and D up a little bit to compensate? Im trying to understand a bit more as well
No problem really... But I think just taking some of the twist out of the frame would be easier that trying to raise three corners...
other-emerald•15mo ago
If I understood the SQUARE Frame Youtube video correctly, because of the combination of the three axis bed vs the 4 axis frame, raising B has exactly the same effect as lowering D. And adjusting B is recommended as there are less vertical (B, De - extrusion at front of electronics and D) extrusions involved. Thinking about it right now, I am wondering if that extra extrusion (De) would impede the adjustability of B also as you are basically trying to get the top horizontal extrusion to bend if you dont loosen the De extrusion.
btw - I avoided printing on the right rear bed, but just had my 1st successful print of a large item (340 x 430 x 77) print (v-core High Voltage area cover). Some minor problems with print quality as I tried to push the print speed without having an accelerometer yet to adjust belt tension and input shaping, but great print adhesion and only slight ringing when I backed back off to 100%.