maker2
Posts: 142
Joined: Sun Jul 19, 2015 9:05 am

symmetric object with asymmetric support material

Here's an object (that I did not design) which appears to be symmetrical.

Notice that Simplify (with default support settings) has only generated support material for the cylindrical bars that stick out on one of the two sides.

Any comments?
xdrip_cap.stl
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dkightley
Posts: 2405
Joined: Tue Mar 10, 2015 4:09 pm

Re: symmetric object with asymmetric support material

Support is not generated on the basis of the symmetry of an object, but based on the average area of a mesh based on the Support Pillar Resolution value in the settings. With your part, one of the sets of horizontal bars falls nicely within one element of the mesh and the area is flagging the generation of support, however the other set of bars does not fall so nicely, and the result is no support.

Moving the part slightly or adjusting the Support Pillar Resolution may bring the pitch of the mesh into line with the pitch of the bars, or as an alternative, you can use manual support placement to put support where the auto-generation is not able to get "right".
Doug Kightley
Volunteer at the National Tramway Museum http://www.tramway.co.uk
Railway modeller and webmaster at http://www.talkingtgauge.net
maker2
Posts: 142
Joined: Sun Jul 19, 2015 9:05 am

Re: symmetric object with asymmetric support material

Brilliant Doug.

Many thanks.

Reducing Support Pillar Resolution from 4mm to 3mm did the trick.

Interestingly, moving the piece around didn't make any difference. So perhaps the mesh you refer to is generated relative to the piece itself and not to the bed?

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