30 degree area across z axis is too high

[Qdeathstar]

hello,

I am calibrating my printer without the screws, and I have been able to get a good test pattern print, however at the last 2-3" of the bed for about a 30 degree arc the extruded position is too high.

I'm not sure what to adjust because the height is fine at the x, y, and z towers....

pics included

[Qdeathstar]

I rechecked the squareness of my arms and everything looks square... my build plate doesnt look bent... its glass...

[Qdeathstar]

No one has ever experienced this before??? It's kinda what I would expect if the z axis was too far leaned back, but I've checked and it's at a 90..

[Xenocrates]

It may be that the spacers holding up the bed are somewhat inconsistent (It has happened), a warp in the mellamine/onyx causing the glass to bow (Yes, glass can bend), or some other oddball thing. You could try using mattercontrol's bed compensation. It doesn't always work, and is often fussy, but it could improve things somewhat.

[Qdeathstar]

I don't think it is the is the glass because I have layed a 12" square across it and didn't see dips.. I'll check one more time...

[Jimustanguitar]

You're not alone.
http://forum.seemecnc.com/viewtopic.php?t=4868

[Qdeathstar]

Wow. something to read. I saw that topic a while back but I forgot about it. thanks. I skimmed through it so far, not sure if you found a solution but NO SPOILERS...

[Qdeathstar]

Are you still just using the shims, Jim? I ask because my printer is only too high on one of the six points mentioned in the topic... though, maybe it is just a touch low on another. this could be like a 5 minute fix if you are still completely satisfied.

so, looks like I could either try this:
http://forum.seemecnc.com/viewtopic.php ... 275#p53565 (messing with endstop offsets and radius)


or I could use Rollie's bed leveling script....

I'm not looking to buy a new board just yet...


being that I've already played with the offsets I think I am going to try Rollie's solution. But is openDACT different than his bed calibration tool ( https://github.com/RollieRowland/Delta- ... ation-Tool ) or does openDACT just have more features?

[dc42]

Some suggestions:

1. From your photo it looks like the Bowden tube is going off in the direction where you have the problem. Is there any play in the joints? If so then the sideways force from the Bowden tube may be reversing in that area, taking up the play in the opposite direction, which causes the effector to tilt and the calibration to go out. The solution is to eliminate play in the joints, however supporting the Bowden tube from the top of the frame with a piece of elastic helps.

2. Try my online delta calibration calculator at http://www.escher3d.com/pages/wizards/wizarddelta.php.

[Qdeathstar]

Hi. Someone esle had mentioned your calibration tool before. I had some issues in figuring out where to put the tower angle corrections, but once I figured that everything looks flat on the first layer.


Still having some issues, but the first layer ain't one

Thanks.