Z-axis up without homing macro

silver1882

I just tried that macro and my head went toward the bed.

Phaedrux

@mrehorstdmd said in Z-axis up without homing macro:

G90 ; set relative positioning mode
G1 Z10 F300 ; move nozzle up (or bed down) 10 mm at 5 mm/sec
G91 ; return to absolute positioning mode

G90 and G91 are reversed in this snippet.

G90 is absolute position, G91 is relative.

https://duet3d.dozuki.com/Wiki/Gcode#Section_G90_Set_to_Absolute_Positioning

mrehorstdmd

@phaedrux Doh! I went back and edited the previous post.
That's what happens when you get old...

Phaedrux

Don't feel bad, I have to open the wiki almost every time just to double check. I've started to remember by thinking that absolute starts with A, so it comes before relative, so it's G90.

mrehorstdmd

@phaedrux I do feel bad- I was looking at the wiki when I wrote it. The error just didn't register...

silver1882

Ok thanks I will give it a try as soon as my printer is done printing.

fcwilt

@silver1882 said in Z-axis up without homing macro:

Ok thanks I will give it a try as soon as my printer is done printing.

Why do you have the M564 commands?

If you are doing this during a print the printer must already be homed.

silver1882

I tested it and that works great thanks.

silver1882

If I am away from my house and I have to cancel the print because of a problem my printer is no longer homed. I just wanted to be able to raise the head so it doesn't cool down setting on the part.

fcwilt

@silver1882 said in Z-axis up without homing macro:

If I am away from my house and I have to cancel the print because of a problem my printer is no longer homed. I just wanted to be able to raise the head so it doesn't cool down setting on the part.

Why do you think canceling a print un-homes the printer?

Phaedrux

It would depend on what you have in cancel.g I think.

fcwilt

@phaedrux said in Z-axis up without homing macro:

It would depend on what you have in cancel.g I think.

Well yes that certainly could happen.

Though why there would be something in the file to do that escapes me at the moment. I haven't found any reason to date to do something that would un-home the printer.

Curious.

Phaedrux

For instance in my cancel.g I home XY and then turn the motors off.

fcwilt

@phaedrux said in Z-axis up without homing macro:

For instance in my cancel.g I home XY and then turn the motors off.

Why do you turn the motors off?

For me most times a canceled print is quickly followed by another attempt after an appropriate change or two.

Frederick

Phaedrux

I suppose just for noise. To start another print it would be re-homing anyway, and depending on why and when it was canceled it might be awhile before another attempt is made.

fcwilt

@phaedrux said in Z-axis up without homing macro:

I suppose just for noise. To start another print it would be re-homing anyway, and depending on why and when it was canceled it might be awhile before another attempt is made.

Noise?

Do your steppers make noise when not moving?

Frederick

Phaedrux

Yeah there's a slight hum/whine when energized. Nothing too offensive. When I was setting up the macros I figured why not power them off?

fcwilt

@phaedrux said in Z-axis up without homing macro:

Yeah there's a slight hum/whine when energized. Nothing too offensive. When I was setting up the macros I figured why not power them off?

Evidence that great minds don't always think alike.

Frederick

Phaedrux

@fcwilt

; cancel.g
;
; Run when the print is paused, and then canceled.
;

G10 P0 R0 S0		; Set hotend temp to 0
M140 S0			; Set bed temp to 0
M106 S255 		; Fan at 100 to cool nozzle and bed
M220 S100		; Set speed factor back to 100% in case it was changed
M221 S100		; Set extrusion factor back to 100% in case it was changed
M290 R0 S0 ; clear babystepping
M204 P1000 T4000	; Set printing and travel accelerations
M566 X900 Y900 Z30 	; Set maximum instantaneous speed changes (mm/min) (Jerk)
G28 XY			; home XY
M98 P"0:/sys/CurrentsNormal.g" ; return motor currents to normal
M98 P"0:/sys/ZSpeedsNormal.g" ; return Z axis speeds to normal
M84			; turn off steppers
G4 S60			; wait 1 minute for nozzle to cool
M107			; turn off the fan
M98 P"0:/macros/Musical Tunes/TwoBits.g" ; play a tune

I suppose now with conditional gcode the homing at the start of a print could easily be made optional, so the logic of turning off the motors since I need to re-home anyway isn't as valid.