gcode for setting temp on bed and hotend

[Bo Herrmannsen]

i know the advice is to let pronterface turn on and off the hotend and heated bed

but i dont want to risk leaving them on for hours

i have looked a bit around to figure the code... or could i just make do by setting the temp in slic3r and set to 0 in pronterface?

/bo

[barnaby]

Not sure about advice, but I usually use Slic3r, mainly because I
usually run a different first-layer bed temp.

Slic3r relies on the custom "end g-code" to switch them off at the end
of the print:

M104 S0 ; turn off extruder
M140 S0 ; turn off bed

I also use custom "start g-code" ensure that Slic3r waits for the temps
from it settings to stabilize so I can start a print from cold:

M104 S[first_layer_temperature] ; hot end
M140 S[first_layer_bed_temperature] ; hot bed
M109; wait till hot
M190; wait till hot

[Bo Herrmannsen]

Hi

thanks...

what will it do for next layers? same temp?

/bo

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[barnaby]

If your 'other layer's bed and extruder temperatures are not 0 (under
Filament settings), then Slic3r will output additional M104/M140's for
each layer change.

[Stuart Ward]

that is a better that what I seem to have, mine has a M190 S[first_layer_bed_Temp] followed by a M109 S[First_Layer_Temp]

 which means that the hotbed heats up before it starts to heat the hot end.

Could you use a M116 instead of the M109 and M190

Stuart

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[barnaby]

Not sure why that is the default, seems unnecessarily slow.

Don't think Marlin supports M116.

[Bo Herrmannsen]

while on temps

what is the recommended temps for PLA?

Last time i set the extruder to 185 and bed to 60 for the whole print

Den 19/11/2013 kl. 17.02 skrev barnaby:

> Not sure why that is the default, seems unnecessarily slow.
>
> Don't think Marlin supports M116.
>

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[Bo Herrmannsen]

oh yes...

and what controls the optional electronics fan?

i have found that the stepper drivers can make do without cooling for very light use

but not for vey long... so i put on a surplus pc case fan that does the job... but its not running much


would love to turn that one with a code as well


/bo

Den 19/11/2013 kl. 17.02 skrev barnaby:

> Not sure why that is the default, seems unnecessarily slow.
>
> Don't think Marlin supports M116.
>

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[Robin Fordham]

I understand the  M190 S[first_layer_bed_Temp] followed by a M109 S[First_Layer_Temp] is used because the bed takes a lot longer to get to temp than the hot end, thus not getting the hot end heated and "cooking" the filament whilst waiting for the bed to get to temp.

I get my bed heated first, then 0 the z, it's surprising the difference in height of the print surface between cold and heated (I measured 0.2mm). Then when I go to print the bed is there anyway so it's only a matter of waiting for the hotend.

I should really test to see if there is much of a difference between Z0 with a hot or cold hotend.

Robin.

[daprigoo]

That is what I do also.

[barnaby]

I zero whilst hot, but I park the head at the end of printing. If I
haven't moved the printer I can get away without re-zeroing the bed the
next time I print.

I suppose you could synchronize your typical heating times with a G4
dwell. Though this would be annoying if you were already at temperature.
(Guess all the conditional G-code no one has bothered to implement was
useful after all ;-) I have not noticed any adverse side effects from
the 'cooking'; though I guess it may be increasing the amount of skirt I
need to print?

[Robin Fordham]

I suppose you could synchronize your typical heating times with a G4 dwell. Though this would be annoying if you were already at temperature. (Guess all the conditional G-code no one has bothered to implement was useful after all ;-) I have not noticed any adverse side effects from the 'cooking'; though I guess it may be increasing the amount of skirt I need to print?

 

TBH I have no idea if heating the plastic  for a while before extruding has any negative effects.

[Stuart Ward]

On 19 November 2013 17:04, Robin Fordham <ging...@gmail.com> wrote:

TBH I have no idea if heating the plastic  for a while before extruding has any negative effects.

The negative is that the plastic in the hot end will seep out, this means that the head is not ready to print when ready and why more skirt may be required.

[John Brown]

Bo,

The auxiliary electronics fan can be switched on with

M42 P15 S255

and off with

M42 P15 S0

In fact it will output a Pulse Width Modulated output for values between
0 and 255, but fans don't always respond to such subtleties.

Regards

John Brown.

[Bo Herrmannsen]

hehe

i know it has to be above some point to run... will have to experiment with what value etc

but thanks for the heads up


/bo