DELTA Trigger height corrections

sylvaindc

Hi All,

I hope someone can help me with this. I am trying to calibrate my Delta. I find quite some drift in the trigger height over the build place (5mm at the worst, see pic) indicating something is not square, which I'll have to fix, but I am hoping I can correct for this until I have time to take thing apart (again)...

I am following https://duet3d.dozuki.com/Wiki/Calibrating_a_delta_printer, but the process of measuring trigger height at different spots is not clear to me.

Question 1: Is it possible to adjust for this large trigger height differential?

Question 2: When measuring trigger height for the purpose of trigger height adjustment in bed.g, should I

calibrate z=0 (jogg till nozzle grabs a piece of paper, G92 Z0, probe for trigger height) or
should I leave the z at whatever it is when I calibrate it to 0 on x=0, y=0 and only calibrate the trigger height)?

Many thanks!

Sylvain

dc42

What type of Z probe does your machine have?

sylvaindc

Your IR probe, I think the oldest version...

dc42

How far is it from the nozzle horizontally?

Have you put a circular spirit level on the effector to look for effector tilt?

sylvaindc

@dc42

Its about 2cm from the nozzle horizontally, I dont have a spirit level on it

I do think its the unsquareness of the build rather than effector tilt though

droftarts

@sylvaindc Are you able to run a bed mesh? Posting the 3D visualisation of this can help diagnose what the cause is. There's a good visual guide here http://boim.com/DeltaUtil/CalDoc/Calibration.html for what causes odd-shape meshes. Having two parameters (or more) can cause it to be pretty strange, though.

Ian

sylvaindc

@droftarts Well, it looks a lot like the tower-0 level... I though that would be corrected by the auto calibration.... I guess I was wrong....

Looks like I'll need to do some measuring with actual precision