G30 Height Tuning using a calibration object
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Edit I can definitely see immediate improvement by adding H-0.05 to the tower probe points, I'll update with a new bed.g file once I get a cleaner calibration cylinder.
Would it make sense to adjust the sensor H values based on a calibration circle and how thick or thin the layer squish appears to be?
I'm thinking I should add H-0.02 to the X, Y, and Z Tower and reprint to see how it looks.
Here's an imgur album of my calibration object (a 0.2mm cylinder with a triangular grid pattern inside, 0.4mm nozzle).
Just an image from the bed:
With FSR sensors, is there a general height setting that I should start with other than zero?
I was thinking about adjusting the H-values 0.04mm at a time until the whole calibration object looks even.
Also, the stated Delta Radius of the Max Metal build I have is 141mm, but calibration tends to put it at 142mm. Should I reset that value to 141mm or just not worry about it?
It looks like along the towers I am too close to the bed.
My G30 probe points from bed.g file currently looks something like:
; bed.g file for RepRapFirmware, generated by Escher3D calculator
; 13 points, 6 factors, probing radius: 130, probe offset (0, 0)
G30 P0 X0.00 Y130.00 Z-99999 H0
G30 P1 X112.58 Y65.00 Z-99999 H0
G30 P2 X112.58 Y-65.00 Z-99999 H0
G30 P3 X0.00 Y-130.00 Z-99999 H0
G30 P4 X-112.58 Y-65.00 Z-99999 H0
G30 P5 X-112.58 Y65.00 Z-99999 H0
G30 P6 X0.00 Y65.00 Z-99999 H0
G30 P7 X56.29 Y32.50 Z-99999 H0
G30 P8 X56.29 Y-32.50 Z-99999 H0
G30 P9 X0.00 Y-65.00 Z-99999 H0
G30 P10 X-56.29 Y-32.50 Z-99999 H0
G30 P11 X-56.29 Y32.50 Z-99999 H0
G30 P12 X0 Y0 Z-99999 S6 -
With FSRs the trigger height will always be slightly below zero, and it may vary depending on how close to one of the FSRs the probe point is. I suggest you measure the trigger height at a few points (see https://duet3d.com/wiki/Calibrating_a_delta_printer#Measuring_the_trigger_height)) and use the results to determine what H corrections you need, if any.
Don't worry about the delta radius being not quite what you expect, unless you have distorted prints. Print a noughts-and-crosses/tic-tac-toe pattern that goes right up to the edges of the printable area, and check that the lines are straight.
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With FSRs the trigger height will always be slightly below zero, and it may vary depending on how close to one of the FSRs the probe point is. I suggest you measure the trigger height at a few points (see https://duet3d.com/wiki/Calibrating_a_delta_printer#Measuring_the_trigger_height)) andf use the results to determine what H corrections you need, if any.
Don't worry about the delta radius being not quite what you expect, unless you have distorted prints. Print a noughts-and-crosses/tic-tac-toe pattern that goes right up to the edges of the printable area, and check that the lines are straight.
Thanks. I'm on a 0.1mm height calibration object right now around 130mm radius and it's looking pretty good.
