1 Topic by Antonious (edited by Antonious 2015-10-04 22:36:17)

  • Antonious
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Topic: Please, what could be the problem with this print?

My first printing with PLA. This is not a XYZ PLA but another one from the brand BQ which is tagged as 220ºC to extrude.

This piece is an ensemble with the letters M, V and U, in which the M has a quite decent appearance.

http://soliforum.com/i/?KApqk31.jpg

However the external curve of the U has been a little disaster-

http://soliforum.com/i/?HNNKRKS.jpg
http://soliforum.com/i/?FyFC7CC.jpg
http://soliforum.com/i/?bBN1FAh.jpg

What do you think the fail is? Which is the cause?

(I was watching while printing at the beginning and saw that the layers were stacking in a perfect horizontal way on the M and the V but were remaining a bit higher in the external sides of the curve of the U in a such way that in the next layer the nozzle of extruder pushed to the material from the previous layer. I'm sure that pushing and rubbing from the nozzle was responsible for the deformation you can see in the pics. How can I correct this behaviour?)

2 Reply by carl_m1968

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Re: Please, what could be the problem with this print?

Looks to hot and printed to fast to me.

Printing since 2009 and still love it!
Anycubic 4MAX best $225 ever invested.
Voxelabs Proxima SLA. 6 inch 2k Mono LCD.
Anycubic Predator, massive Delta machine. 450 x 370 print envelope.

3 Reply by Antonious (edited by Antonious 2015-10-04 23:04:59)

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Re: Please, what could be the problem with this print?

carl_m1968 wrote:

Looks to hot and printed to fast to me.

Any explanation about why all is ok except for the bent external faces of the U? (why when printing these two faces the layers were built higher than the other ones?)

Thanks.

4 Reply by carl_m1968

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Re: Please, what could be the problem with this print?

Overhangs like the lower part of the U need to be printed slow and probably should have been done with supports as well.

Printing since 2009 and still love it!
Anycubic 4MAX best $225 ever invested.
Voxelabs Proxima SLA. 6 inch 2k Mono LCD.
Anycubic Predator, massive Delta machine. 450 x 370 print envelope.

5 Reply by scobo (edited by scobo 2015-10-05 06:20:56)

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Re: Please, what could be the problem with this print?

As Carl said, try printing slower and use a layer fan to cool the PLA as it prints.
A layer fan will help greatly with small parts and overhangs.

Davinci 1.0 with repetier firmware & E3D V6 Lite
Anycubic Photon DLP printer, Einscan-S 3D scanner
Simplify3d, 123D Design, Meshmixer
http://www.thingiverse.com/scobo/designs

6 Reply by Antonious

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Re: Please, what could be the problem with this print?

My theory (starting from my lack of experience) is that overhang sections, not having under them a material which to stick to, tend to stick with the nozzle of the extruder and lift from their right position (then the problem of the nozzle pushing and rubbing that lifted material). If so, providing a material like supports under them, they could remain in their horizontal position, and maybe, increasing the temperature, a more fluent PLA wouldn't have that tendency to remain stuck with the nozzle. I don't know how the speed could affect with this issue.

I have to experiment these two ways: adding supports (I think itsn't usual to add supports to a circular shape as bottom U) and raising temperature.

(The problem with the overhangs in this case isn't that these ones go down but they go up)

7 Reply by georgehine

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Re: Please, what could be the problem with this print?

it appears to have some z banding on the face of the U in the second picture as well!

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