Material Keep-Warm Temp Can Cause Clog?

inventabuild
Posts: 271
Joined: 09 Nov 2014, 23:03

Material Keep-Warm Temp Can Cause Clog?

Post by inventabuild »

I have a dual extruder on my TAZ 4 and I'm extruding ABS at 230 C in the first extruder and HIPS at 230 C in the second extruder. I wanted to set the Keep-Warm temp of the non-working extruder below 230 to prevent the ABS / HIPS from cooking and possibly causing a clog in the hot end; however when I set the Keep-Warm temp to the recommended 65% of the Main temp (230 C) then KISSlicer starts using the previously idle extruder at the Keep-Warm temp (150 C) without giving it a chance to warm up to its Main temp of 230 C before using it to extrude. I'm concerned this in itself will be what causes a clog.

Why doesn't KISSlicer let the idle extruder heat up to its Main temp before using it to start extruding?
Mikk36
Posts: 65
Joined: 08 Nov 2014, 14:46

Re: Material Keep-Warm Temp Can Cause Clog?

Post by Mikk36 »

What printer, what firmware, what g-code data in the "select extruder" area?
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Davide Ardizzoia
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Re: Material Keep-Warm Temp Can Cause Clog?

Post by Davide Ardizzoia »

Hips and Abs are quite free from cooking/clogging (as long as you don't overheat them...if you stay at 240°C you're safe).
The real problem is the extruder oozing...
Cooking is something to be afraid of when you use PVA.

Best Regards
Davide Ardizzoia
inventabuild
Posts: 271
Joined: 09 Nov 2014, 23:03

Re: Material Keep-Warm Temp Can Cause Clog?

Post by inventabuild »

Davide, that's good info, so maybe I need to use a wipe pillar when dual extruding and keeping both extruders at Main temp.
inventabuild
Posts: 271
Joined: 09 Nov 2014, 23:03

Re: Material Keep-Warm Temp Can Cause Clog?

Post by inventabuild »

Mikk36, here's my specs:

Printer: Lulzbot TAZ 4
Firmware: Marlin-2014Q3_rB
G-code Prefix tab:

G28 ; home all axes
M203 X192 Y208 Z3 ; Speed limits to minimize skipped steps when moving really fast courtesy of forum.lulzbot.com user 1013
M218 T1 X0.252 Y-55.46 ; Dual extruder offsets

I would like to add some gcode that makes both extruders reach Main temp before either starts to extrude during a print. Perhaps w/ my current materials it is not an issue that could lead to clogging the hot end, but as my material choices expand I would like to make sure I am covered.

Edit:
I think Select Extruder tab gcode is what you are interested in:

; Select extruder, warm, purge
; 5D-style
T<EXT+0>
M104 S<TEMP>
inventabuild
Posts: 271
Joined: 09 Nov 2014, 23:03

Re: Material Keep-Warm Temp Can Cause Clog?

Post by inventabuild »

Thanks, do you know the variable name for bed temp in Kisslicer? I use <Temp> for the extruders, but that variable doesn't work for the bed.
Mikk36
Posts: 65
Joined: 08 Nov 2014, 14:46

Re: Material Keep-Warm Temp Can Cause Clog?

Post by Mikk36 »

inventabuild wrote:
Thanks, do you know the variable name for bed temp in Kisslicer? I use <Temp> for the extruders, but that variable doesn't work for the bed.
<BED>
inventabuild
Posts: 271
Joined: 09 Nov 2014, 23:03

Re: Material Keep-Warm Temp Can Cause Clog?

Post by inventabuild »

<BED> does not work as a variable to set the bed temp in the G-code prefix tab. Can you please provide additional info?

Edit - As I'm just learning gcode I did not put S in front of bed <TEMP> variable . Will try that.
Last edited by inventabuild on 04 Dec 2014, 04:24, edited 1 time in total.
inventabuild
Posts: 271
Joined: 09 Nov 2014, 23:03

Re: Material Keep-Warm Temp Can Cause Clog?

Post by inventabuild »

I was using the following code and not only did my bed not heat, but my extruders got switched around so Ext+0 became Ext+1 and vice versa. Is it a problem w/ my gcode or a bug in slicer?

T<EXT+0>
M104 S<TEMP> ;start heating EXT+0, no wait
T<EXT+1>
M104 S<TEMP> ;start heating EXT+1, no wait
M140<BED> ;start heating bed, no wait
T<EXT+0>
M109 S<TEMP> ;set nozzlet temp, wait
T<EXT+1>
M109 S<TEMP> ;set nozzlet temp, wait
M190<BED> ;set bed temp, wait
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