Page 1 of 1

Software temp vs hotend temp

Posted: Thu Dec 10, 2015 10:44 am
by middelweerd
Hi all,

After doing a few mods to be able to print with PLA on my Up! Mini I tried to rule out temperature issues on the stepper motor and feeder gear.
Using a thermal camera to measure the temperature while printing I've noticed something odd.
The temperature in the 'maintenance' menu indicates 207 C (PLA settings) while my thermal camera registered a temperature of 160 C!
Did anyone notice this before? What could cause this difference and what should be replaced?

The indication of room temp is correct.

The overall problem I walk into with printing PLA is that after a while the PLA stops flowing. This happens while it is printing the first layer (I'm printing raftless) or after a couple of layers or anything between that. A withdraw always shows a stripout by the feeder gear. I use ColorFabb PLA.

What I have modded so far:
- I've insulated the hotend with high temperature insulation tape (http://www.amazon.com/Ceramic-Insulatio ... B00I5093KU) and Kapton tape.
- Modified the extruder feeder with http://www.thingiverse.com/thing:506516 (original design http://www.thingiverse.com/thing:18010) to fit two extra fans to cool the stepper motor
- Added a few extra heat sinks on the stepper motor
- Fish tank pump to cool the feeder gear.
- Thumbwheel temp mod by Roller (http://www.thingiverse.com/thing:528396)
- Filament dust filter (http://www.thingiverse.com/thing:639575)
- Filament spool holders so the spool runs more freely (http://www.thingiverse.com/thing:93652)
- FixUp3D software temp mod (not used together with thumbwheel temp mod)
- Temp mod on heated bed (not used while printing PLA)

I've tried to increase the distance between the nozzle and buildplate.
I remove all the covers of the enclosure I can while printing PLA.

Thanks,
Coen

Re: Software temp vs hotend temp

Posted: Fri Dec 11, 2015 11:32 pm
by DrewPetitclerc
This a truly classic case of what happens with and "all metal" hotend, the PLA can swell as it warms up and it will stick to the side walls of the steel barrel, this is why most machined build for PLA use a PTFE (nylon) tube or insert for the hotend, I switched to a Recreus hot end for my "UP Plus Pro" and all those issues went away, I use any filament regardless of the material on my machine now.
http://recreus.com/en/18recreus-extruders

Regards
Drew

Re: Software temp vs hotend temp

Posted: Sat Dec 12, 2015 11:11 pm
by mb20music
Try rubbing some Canola cooking oil on the pla before inserting it into the extruder, so far it has worked for me and I have tried several different brands of PLA and even on 5 hour long prints...

Re: Software temp vs hotend temp

Posted: Sun Dec 13, 2015 11:15 am
by middelweerd
DrewPetitclerc wrote:This a truly classic case of what happens with and "all metal" hotend, the PLA can swell as it warms up and it will stick to the side walls of the steel barrel, this is why most machined build for PLA use a PTFE (nylon) tube or insert for the hotend, I switched to a Recreus hot end for my "UP Plus Pro" and all those issues went away, I use any filament regardless of the material on my machine now.
http://recreus.com/en/18recreus-extruders

Regards
Drew
mb20music wrote:Try rubbing some Canola cooking oil on the pla before inserting it into the extruder, so far it has worked for me and I have tried several different brands of PLA and even on 5 hour long prints...
Thanks for you replies guys!
I've been looking into that Recreus hot end earlier but hoped I didn't have to invest more than was necessary.
However, what must be done, must be done.

Thanks,
Coen

Re: Software temp vs hotend temp

Posted: Fri Dec 18, 2015 12:38 pm
by middelweerd
DrewPetitclerc wrote:This a truly classic case of what happens with and "all metal" hotend, the PLA can swell as it warms up and it will stick to the side walls of the steel barrel, this is why most machined build for PLA use a PTFE (nylon) tube or insert for the hotend, I switched to a Recreus hot end for my "UP Plus Pro" and all those issues went away, I use any filament regardless of the material on my machine now.
http://recreus.com/en/18recreus-extruders

Regards
Drew
Hi Drew,

Do you have an emailadress of Recreus so I can directly email them? They don't respond to my message on their website.

Thanks!
Coen

Re: Software temp vs hotend temp

Posted: Fri Dec 18, 2015 2:16 pm
by mb20music
Try this...


info@recreus.com

Re: Software temp vs hotend temp

Posted: Mon Dec 21, 2015 7:49 pm
by middelweerd
mb20music wrote:Try this...


info@recreus.com
:roll:
Thanks

Re: Software temp vs hotend temp

Posted: Mon Dec 28, 2015 11:44 am
by middelweerd
Still nothing...