Printing shell

goldenage · April 10, 2015, 9:19pm

Hello all :) ,

new to 3D printing with the Zortrax as my first and only printer I guess I have learned a lot while reading here (and similar forums) and started the challenge yesterday. I own a CNC mill doing RC models as a hobby so the whole stuff is not completely new to me, however different enough. Beside a first simple object to check wether the printer works as it should (it does) I am looking for trouble ;) with complicated things and would be happy to hear the opinion of the experts for a fillet, covering the intersection of a strut to a fuselage. Object is about 50mm high and consists only of a shell, thickness 0.5mm (can be increased a bit if necessary).

Its also hard to thermoform cause of undercuts.

Picture 1 shows the setup of the first attempt (two fillets at the same time)

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The fillet split during printing in the front, flat part, likely because there is no support structure. Support was 20Â°, even with higher angles there is never a support structure at this particular point.

Right now a second attempt with Z-ABS Ultra and higher fan speed shows the same result.

Are there any suggestions about a better orientation? Maybe as shown in pic 2:

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Or upside down, or laying aside? Or ist it impossible to print?

regards

Andi

Andre · April 10, 2015, 9:29pm

Can you show a pic of the failed print?

0.5mm wall thickness is pushing it.

I wouldn’t go below 0.8

goldenage · April 10, 2015, 10:08pm

Will make pic tomorrow. Can I use the advanced settings, offsets, outer contours for this?

regards

Andi

goldenage · April 11, 2015, 5:03pm

Pic of the print, stopped and not finished. The printer prints the up the slope pretty well, even ~ 6-7 mm beyond the support in free air. Then the material bends a bit up and the next printing paths cannot match anymore.

I could thick up the shell, but will this prevent warping?

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regards

Andi

swarf_rat · April 12, 2015, 8:51pm

Something funny (and ugly) going on there. Can you post the file?

goldenage · April 13, 2015, 11:44am

In the attachment. Meanwhile I had success when positioning the objects like in pic 2 with ABS Ultrat. Only surface was poor compared to other prints, maybe the fan was too high keeping things too cool this time.

Thanks

Andi

goldenage · April 17, 2015, 5:52pm

So, after some trials I get reproducible results when arranging the fillets like in pic1:

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Thickness of the shell is drawn in 0,5mm and printed in 0,8mm. Thats fine with me, just had to rework the drawing so that the whole thing has a snug fit over the strut. The 0,8mm are reproduced every time, so thats great.

I think I like 3D printing :)

And thats what I am talking about:

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Another luxury issue solved. :D

regards

Andi