need idea for end script

boelle

For some time my end script have looked like this:

M104 S0 ; extruder off

G91; Switch to relative coordinates

G0 Z10; Move up 10mm

G90 ; absolute positioning

G0 X125 ; Park in middle

G0 Y235 F5000 ; Move Y to middle of bed cooling fan

M42 P11 S255 ; Turn Bed cooling fan on

M106 ; cool off nozzle

M190 S30; set bed and wait to hit target

M42 P11 S0 ;Turn off bed cooling fan

M140 S0 ; bed off

M107 ; carriage fan off

G28 Y; home Y

G28 Z ; Home Z

M84 ; disable motors

M81; power off

now the strange thing is that as the bed comes close to the 30 degree setting the LED on the bed starts to flash just once every 5 sec or so. this was not a problem until last night where the temp never reached 30 but it was arround hovering arround 39

are there better and more "foolproof" ways to do the same?

the bed cooling was should not be misunderstood as a part cooling fan. the bed cooling fan is only used after the print is done to cool the bed down faster.

could i use M226 so that it will just wait forever for me to push the knob on the LCD ? or is the command in repetier different?

boelle

i was thinking of adding my bed cooling fan to pins.h and use M106 to set a thermostatic trigger

but i would still need a kind of wait on the temp so the bed stays in front of the fan until its cool enough

boelle

ahh i have been blind

M190 S30; set bed and wait to hit target

needs to change to

M190 R30; set bed and wait to hit target

correct?

boelle

i found this

http://forum.repetier.com/discussion/812/wait-for-cooling-bed<br/><br/>so now my Q is how do i mod the code to accept the R paramter?

Repetier

M190 S30
is correct. No idea what R should de. M190 is already wait.

Problem can be depending on heat controller. Everything else then bang-bang will get spikes of heating especially PID and dead time, so these can be very hard in low temperature regions.

A more safe solution would be
M140 S0
G4 S60

With G4 wait adjusted to what it needs to cool down normally to be below 30°C if no spikes occur.
This will always succeed and is also faster from missing spikes.

boelle

R is when you want to cool of the bed. or the oposite of heating

i know the G4 method but i dont want to use that if i can avoid it

boelle

instead of G4 is there a command for waiting that i click the knob on the display?

i could live with that ie it just runs the bed cool down fan until i click the knob

Repetier

No interactive gcodes, sorry.

M190 S30
will wait for cooling. Problem is that PID/dead time are optiimized for hot temperature and at low temperatures a smaller time is needed to go up a bit. Therefore these spikes have more effect and makeing it harder to reach the +/-1°C corrdidor for target temp.

boelle

hehe.... the lowest temp i see is arround 39

oh well G4 it is.... i could go to marlin but man their list of issues are like sticking a hand i a wasp nest

Repetier

Have you already tried heat manager 0 instead? That should go down smoothely to 30°C. The bigger swings on target temp are not so important for the bed and can be ignored.

boelle

hehe... i found out the issue...

bad thermistor, it gave up last night and caused a decouple error

i'm now tinkering with replacing it with a thermocouple so i dont have to take the bed assembly apart every 3 months or so

i used G4 as a temp. fix but the thermistor must had one leg in the coffin as it did not last more than 30% in to a 20 hour print

will open a new post for the thermocouple idea