1 Topic by WhiteStar01

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Topic: Fan on/high speed when print finished option?

Just swapped out my Z screw and a new stock hotend and while enjoying the fantastic new prints- I contemplated the amount of time it takes the extruder to cool down after the print is done.  I have the standard extruder fan mod for my Solidoodle 2- and with no fan on (as I do for larger prints) the extruder takes a long time to cool- all the while baking the ABS in the nozzle.

I kicked the fan on high and observed the cooling time to get below 100 degrees- just a handful of seconds once the heater is off.

Any thoughts how I could add a G code to the end (or other method) which would turn the fan on high to cool the extruder fast?

Thanks!

2 Reply by grob (edited by grob 2014-05-07 04:26:15)

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Re: Fan on/high speed when print finished option?

Try this (after your final move and home I suppose, wherever you like):

M106 S255 ; turn fan on full
G4 P5000 ; wait 5 seconds
M106 S0 ; turn fan off

No guarantees, untested. smile

This is the resource for g-code instructions specific to our printers: http://reprap.org/wiki/G-code

SD3. Mk2b + glass, heated enclosure, GT2 belts, direct drive y shaft, linear bearings, bowden-feed E3D v5 w/ 0.9° stepper
Smoothieboard via Octoprint on RPi

3 Reply by WhiteStar01

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Re: Fan on/high speed when print finished option?

Fantastic!  I should have thought of that smile

The M106 works perfectly so if the delay works- this is perfect.  Added for my next print.

Thanks!

4 Reply by grob

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Re: Fan on/high speed when print finished option?

Let us know if it works - I've never tested a G4 before!

SD3. Mk2b + glass, heated enclosure, GT2 belts, direct drive y shaft, linear bearings, bowden-feed E3D v5 w/ 0.9° stepper
Smoothieboard via Octoprint on RPi

5 Reply by WhiteStar01

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Re: Fan on/high speed when print finished option?

It works PERFECTLY!  I added it into my custom ending G-code in RH. I had to extend the value quite a bit- truly trying to make the likelihood of baked filament as low as possible.  I think this should help plenty.  It cannot hurt!

My code:
G28 X0 Y0  ; home X axis and y axis
M104 S0 ; kill extruder temperature
M140 S0 ; kill bed temperature
M106 S255 ; turn fan on full
G4 P300000 ; wait 300 seconds
M106 S0 ; turn fan off
M84 ; disable motors

Thanks again!

Cheers

6 Reply by wardjr

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Re: Fan on/high speed when print finished option?

Nice work... Makes me happy to own an E3D wink

Printit Industries Model 8.10 fully enclosed CoreXY, Chamber heat
3-SD3's & a Workbench all fully enclosed, RH-Slic3r Win7pro, E3D V6, Volcano & Cyclops Hot End
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Thanks to all for your contributions

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7 Reply by grob (edited by grob 2014-05-08 02:58:29)

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Re: Fan on/high speed when print finished option?

Hehe sounds like 5 mins of fan is going to help cool the print too, make it pop off quicker. I approve of your impatience! smile

SD3. Mk2b + glass, heated enclosure, GT2 belts, direct drive y shaft, linear bearings, bowden-feed E3D v5 w/ 0.9° stepper
Smoothieboard via Octoprint on RPi

8 Reply by WhiteStar01

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Re: Fan on/high speed when print finished option?

Haha smile  Actually this last print RH got "stuck" after everything shut down so maybe there is a timeout in RH- I may need to scale back the delay a bit.  So far, so good though.

9 Reply by grob

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Re: Fan on/high speed when print finished option?

Yeah, that makes sense - same thing with the 'wait until temp' commands - any new commands just go into the buffer, as the printer is still 'processing' the current command.

Does anyone know a tidy way to cancel a running 'wait for temp' or pause command?

SD3. Mk2b + glass, heated enclosure, GT2 belts, direct drive y shaft, linear bearings, bowden-feed E3D v5 w/ 0.9° stepper
Smoothieboard via Octoprint on RPi

10 Reply by WhiteStar01 (edited by WhiteStar01 2014-05-08 03:41:23)

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Re: Fan on/high speed when print finished option?

On a plus note- my prints are now bordering on "superstar" level. smile

A year and a half of chasing issues- the new hotend solved 90% of the inconsistency ( ther was defenitely a deformation probably due to me running it into the glass bed).  The intermittent Z banding remained despite the brand new Z stepper and lead- for the FIRST time I adjusted the voltage (it was only off by a MINUSCULE amount) well... you be the judge.

Couldn't be happier right now.

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11 Reply by grob

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Re: Fan on/high speed when print finished option?

That's a glorious piece of plastic right there. Nice work!! smile

SD3. Mk2b + glass, heated enclosure, GT2 belts, direct drive y shaft, linear bearings, bowden-feed E3D v5 w/ 0.9° stepper
Smoothieboard via Octoprint on RPi

12 Reply by WhiteStar01

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Re: Fan on/high speed when print finished option?

Thanks very much.

i only wish I could have achieved this quality while I was building this:
https://www.youtube.com/watch?v=zh7q8b9 … _Vx7oc2rg9

Would have saved a tonne of dremel work tongue

13 Reply by accusedmonk

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Re: Fan on/high speed when print finished option?

grob wrote:

That's a glorious piece of plastic right there. Nice work!! smile

+1  I definitely agree with grob.  All your work has certainly paid off.

Bowden SD3, Rumba, E3D hotend, Mk5 with RtRyder changes, Direct drive Y axis and bearings, GT2 pulleys and braided fishing line, Lawsy linear bearing conversion, M3 Z screw.