Hi all,
I have a specific problem with my Delta printer when S3D starts a print. My printer homes to the top, and it has quite a travel down after preheating the hotend then bed. Because I use PETG, this typically means I need to watch and somewhere around 5 cm remaining, pluck the oozing filament from the hotend before it touches down in the center of my print before moving to the perimeter to start the skirt.
Is there a start script I could employ that directly moves the nozzle to the outside perimeter after the home+preheat phase? As it stands, if I forget to watch the hotend down, I will have a single errant strand of filament on the bottom of my print. I tried searching the forums because I cannot believe this would be such an uncommon issue with Deltas, but maybe others print offset from the center or use PLA.
Let me know if I have a certain misconception or am going about this wrong!
Re: delta skirt starting position
If you want your print-head to move to the edge of the bed before starting a print you'd need to add a G1 command to move to the edge.
This code is about the simplest you could use. I used this snippet at the start of my job files for a long time.
*** THIS CODE ASSUMES ABSOLUTE POSITION COORDINATES ***
You'd have to un-pause your printer after you cleaned off the nozzle.
If you wanted to (and if your machine's geometry & firmware allows), you could get a little fancier and move the nozzle off the edge of the bed and wipe the string off on the bed edge like this:
This code is about the simplest you could use. I used this snippet at the start of my job files for a long time.
*** THIS CODE ASSUMES ABSOLUTE POSITION COORDINATES ***
Code: Select all
G1 X<bed radius> Z25 F<feedrate> ; Move to the edge of the bed, 25 mm above the print surface
M226 ; pause for you to clean the strings off the nozzle
If you wanted to (and if your machine's geometry & firmware allows), you could get a little fancier and move the nozzle off the edge of the bed and wipe the string off on the bed edge like this:
Code: Select all
G1 X<bed radius> Z10 F<feedrate> ; Move to the edge of the bed, 10 mm above the print surface
M564 S0 ; turn off axis limits
; *** IF YOU DO THIS AND ISSUE A LARGE MOVEMENT COMMAND YOU CAN DAMAGE YOUR PRINTER ***
; *** IF YOU ARE USING RELATIVE COORDINATES THE FOLLOWING G1 COMMANDS WILL LIKELY DAMAGE YOUR PRINTER ***
G53 ; FORCE movement to use absolute coordinates
G1 X<bed radius+a little> Z0 F<slow feedrate> ; Move the nozzle to zero height but just past the edge of the bed
G1 X<bed radius-a little> Z0 F<slow feedrate> ; wipe the string/ooze off on the edge of the bed
M564 S1 ; turn axis limits back on
G1 Z10
