Burning marks

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hajime
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Joined: Sat Apr 20, 2013 5:51 am

Burning marks

Post by hajime » Sun Nov 03, 2013 6:25 am

Hello, I have printed a few models. Even on a flat bracket, I can see brownish marks or lines. I suppose they are burning marks from the print head. Is this normal? How can I avoid this problem? Thanks.

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wackojacko
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Re: Burning marks

Post by wackojacko » Sun Nov 03, 2013 8:43 am

Ensure you keep the outside of the nozzle clean. This can happen if you print with the wind barrier door closed.
Bruce
http://www.3DPrintingSystems.com

Need help with your printer, check out our Youtube channel.
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roller
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Joined: Sat Oct 06, 2012 9:09 pm
Location: Brisbane, Australia

Re: Burning marks

Post by roller » Sun Nov 03, 2013 11:06 am

It seems also to be a by-product of a new printer. They test the extruders in the factory and seem to leave a few roasted black bits in there. Took me a few rolls of filament to get it all out (white is so easy to discolour).

mrt
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Re: Burning marks

Post by mrt » Sat Nov 09, 2013 8:50 am

I have had this happen on certain prints and found it can be solved by printing multiples of the same item.

Example: I have a sample monkey figure that I print regularly. This will always burn the ears of the figurine when printing with white. (It may happen with other colours but it’s not noticeable) Because the ear section is so fine I noticed that as the print nozzle is laying ABS on the ear the heat is too great and the ear tends to curl up and touch the nozzle and which results in burn marks.

When I print this now I print multiple copies at once usually 3. This gives this ear section more time to cool and solidify while the printer is moving between the other 2 monkeys.

Hope this helps.
Michael
3D Printing Solutions
www.3dprintingsolutions.com.au

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

Re: Burning marks

Post by mb20music » Tue Nov 12, 2013 2:10 am

I was getting burn marks with the OEM white filament as well. I have the Octave nozzle temperature reducing switch that is recommended for non-OEM filament, so I tried printing the OEM white filament at the lower temp setting and discovered that I don't get burn marks. It extrudes just fine, at least it does for me, when using the OEM filament at the lower temperature setting.

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wackojacko
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Re: Burning marks

Post by wackojacko » Tue Nov 12, 2013 2:52 am

The burn marks are caused by the part lifting / warping higher than the nozzle height. To reduce this open the wind barrier door
Bruce
http://www.3DPrintingSystems.com

Need help with your printer, check out our Youtube channel.
https://www.youtube.com/user/3dprinting ... /playlists

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