Start printing halfway Z-axis

[jeex 35]

How can i make my UM2 start printing at a hight of say 5mm above the glass plate, but on top of an earlyer printed object?

[gr5 2,172]

learn gcodes. Here's a good reference:

http://reprap.org/wiki/G-code

The key feature you want is the "G92" command. so for example you can move up 5mm like this and then tell the printer this is the new 0mm:

G1 z5

G92 Z0

[jeex 35]

I was hoping for a more convenient answer. I already speak 11 programming languages fluently and am not too keen on learning no 12. But, here we go...

[neotko 1,417]

You have a direct answer right there

G1 Z5 ; moves the bed to 5mm

G92 Z0 ; defines that position as 0

[tinkergnome 927]

I was hoping for a more convenient answer. I already speak 11 programming languages fluently and am not too keen on learning no 12. But, here we go...

 

Hi jeex,

haha, this sounds a bit like a motion picture.... jeex eleven, jeex twelve... to be continued...

Is Python included? You could try to reawaken the Cura plugin XYZshift - this would be very convenient ... afterwards...

Or use Simplify3D and set the global offsets on the gcode tab... very convenient too... but not free....

[jeex 35]

LOL. I prefer convenient over free ;-)

[jeex 35]

You have a direct answer right there

G1 Z5 ; moves the bed to 5mm

G92 Z0 ; defines that position as 0

 

Lazy me has one more question: where in the gCode do i put these two lines?

[neotko 1,417]

I suppose since um2 don't use header for heating/prime. It should go at start? I'm more a umo+ guy. If you post your first 10 lines it should be easy to point

[jeex 35]

Ohoh. One more script to go.

After the print job is done, raising the buildplate, set fan to 100% and rotating the fan above the objects to force cooling down the objects.

My super glue spray only lets go if the plate is cooled down. Amazing stuff: sticks like hell when warm, not sticky at all when cold. I tried this way of forced cooling manually and it works great.

So language no.12 here we go. Learning gcode.

[neotko 1,417]

You want to make the head keep on a loop over the printed object while the fan it's at 100%?

[neotko 1,417]

Marlin doesn't support scriptable Gcodes (that would rock btw).

So, the think you could do at the end of the gcode it's:

 

;End GCodeM104 S0 		;extruder heater offG91 		;relative positioningG1 E-1 F300 		;retract the filament a bit before lifting the nozzle to release some of the pressureG1 Z+15 E-3 X-20 Y-20 F3000 		;move down Z 15mm, retract filament more, move X -20mm and Y-20mm you can adjust this movements as you see fit the F it's the speedM160 255 ;Fan at maxM140 S30 		;Set bed to heat to 30CM190 S30  		;Wait until bed has reached 30CM140 S0 		;heated bed heater offM107		; fans offM84                         ;steppers off

 

Edit: Changed the code...

Edited October 29, 2015 by Guest

[jeex 35]

Nice. Thanks.