Software temp vs hotend temp

Support for UP mini. To report a bug, post with a title [BUG REPORT]. To request a feature, post with a title [FEATURE REQUEST]
Post Reply
middelweerd
Posts: 10
Joined: Tue Aug 12, 2014 8:11 pm

Software temp vs hotend temp

Post by middelweerd » Thu Dec 10, 2015 10:44 am

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

User avatar
DrewPetitclerc
Posts: 581
Joined: Sat Feb 12, 2011 7:39 am
Location: Silicon Valley California
Contact:

Re: Software temp vs hotend temp

Post by DrewPetitclerc » Fri Dec 11, 2015 11:32 pm

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
Drew Petitclerc
Petitclerc Designs
Owner/Senior Principal Designer, prototype, tooling and test equipment design and 3D printing
http://flash-graphics.deviantart.com/
http://www.thingiverse.com/DrewPetitclerc

mb20music
Posts: 375
Joined: Thu Feb 14, 2013 1:35 am
Location: USA

Re: Software temp vs hotend temp

Post by mb20music » Sat Dec 12, 2015 11:11 pm

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...

middelweerd
Posts: 10
Joined: Tue Aug 12, 2014 8:11 pm

Re: Software temp vs hotend temp

Post by middelweerd » Sun Dec 13, 2015 11:15 am

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

middelweerd
Posts: 10
Joined: Tue Aug 12, 2014 8:11 pm

Re: Software temp vs hotend temp

Post by middelweerd » Fri Dec 18, 2015 12:38 pm

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

mb20music
Posts: 375
Joined: Thu Feb 14, 2013 1:35 am
Location: USA

Re: Software temp vs hotend temp

Post by mb20music » Fri Dec 18, 2015 2:16 pm

Try this...


info@recreus.com

middelweerd
Posts: 10
Joined: Tue Aug 12, 2014 8:11 pm

Re: Software temp vs hotend temp

Post by middelweerd » Mon Dec 21, 2015 7:49 pm

mb20music wrote:Try this...


info@recreus.com
:roll:
Thanks

middelweerd
Posts: 10
Joined: Tue Aug 12, 2014 8:11 pm

Re: Software temp vs hotend temp

Post by middelweerd » Mon Dec 28, 2015 11:44 am

Still nothing...

Post Reply