Mid-air Printing with BLtouch and Delta Printer

Veti

@sniper23 said in Mid-air Printing with BLtouch and Delta Printer:

M665 R155 L397.19 B155 H520 ; Set delta radius, diagonal rod length, printable radius and homed height
M666 X0 Y0 Z0 ; Put your endstop adjustments here, or let auto calibration find them

these are not the results of the delta calibration, you have to save the values from the delta calibration.
please read
https://duet3d.dozuki.com/Wiki/Calibrating_a_delta_printer

sniper23

@Veti Parameters in config override? or this one?

Calibrated 6 factors using 13 points, deviation before 0.082 after 0.080

droftarts

@sniper23 said in Mid-air Printing with BLtouch and Delta Printer:

@Veti Parameters in config override?

You update the parameters in config.g with the results from running bed.g. It should mean you don't have to run bed.g every time. However, if you're going to run bed.g every time you turn the printer on, or you are confident that your delta sizes are correct (my delta constantly tells me to change them, because my bed isn't square to the axes) you don't have to.

Can you post your homedelta.g?

Ian

sniper23

@droftarts

; homedelta.g
; called to home all towers on a delta printer
;
; generated by RepRapFirmware Configuration Tool v2 on Tue Aug 27 2019 19:34:39 GMT+0300 (GMT+03:00)
G91                        ; relative positioning

G1 S1 X705 Y705 Z705 F3600 ; move all towers to the high end stopping at the endstops (first pass)
G1 X-5 Y-5 Z-5 F3600 S2    ; go down a few mm
G1 S1 X10 Y10 Z10 F360     ; move all towers up once more (second pass)
G1 Z-5 F6000               ; move down a few mm so that the nozzle can be centred
G90                        ; absolute positioning

Veti

@sniper23 said in Mid-air Printing with BLtouch and Delta Printer:

Parameters in config override?

you have not enabled config overwrite. therefore those settings will get ignored.

droftarts

@sniper23 said in Mid-air Printing with BLtouch and Delta Printer:

M587 S"Akpa YapI" P"3672436724" I192.168.1.4 J192.168.1.1 K255.255.255.0 ; Configure access point and IP addresses. You can delete this line once connected

Not related to your problem, but delete or comment out this line from your config.g. As it says in the gcode dictionary:

Important! Do not use M587 within config.g. As well as being a security hazard, writing the access point parameters to WiFi chip every time you start the Duet may eventually wear out the flash memory. Also, the wifi module does not get enabled until the end of running config.g. It is better to use a macro to send M587 (source: https://forum.duet3d.com/post/42798)

Ian

droftarts

homedelta.g looks sensible. At what point are you seeing the homing offset problem? Is it after running bed.g? Because you probably need to run G28 after the bed.g to reset the Z home if bed.g is applying a large correction.

Ian

sniper23

@droftarts Homing offset?

My printer runs automatically G28 before delta calibration. After calibration results look normal (but can't see the map as with g29). After that print starts and mid printing happens.

Veti

you still need to save the values from the delta calibration.

droftarts

@sniper23 said in Mid-air Printing with BLtouch and Delta Printer:

@droftarts Homing offset?

At some point a different offset is being applied to the homed position of Z=0 when nozzle touches bed.

My printer runs automatically G28 before delta calibration. After calibration results look normal (but can't see the map as with g29).

After bed.g calibration, send G28. Then send G1 X0 Y0 Z0. Is the nozzle offset from the bed?

After that print starts and mid printing happens.

So it's in the Gcode created by Simply3D (Simplify3D?)? I don't use Simplify3D, but check settings for any Z offset there.

Ian

sniper23

@droftarts I already did G1 X0 Y0 Z0, the same position happens when bl touch starts probing. After playing with my trigger height. I was able to print properly, but there is another problem. While it is printing fine on one side of the bed, it's not the same for the other side. A little air printing happens. Now, we need to find fix for that.

Danal

@sniper23 said in Mid-air Printing with BLtouch and Delta Printer:

I already did G1 X0 Y0 Z0, the same position happens when bl touch starts probing.

The phrase "the same position happens when bl touch starts probing." should not be a factual statement. Z0 is not the start position for bltouch probing.

So let's verify: Enter a "G1 X0Y0Z0" manually.

When that move finishes, is the nozzle just touching the bed?