DrBoo
Posts: 6
Joined: Wed Aug 30, 2017 7:23 am

Missing Support on rotated objects?

I have an odd situation where support is not generated for an object that has been rotated. I probably don't understand how to do supports properly, but in any case, here's the issue... I'm printing the INMOOV part "coverfinger1". I've rotated it so that it's orientated 90 degrees, giving it a vertical aspect.
I then try generating supports. I see the following in preview...
preview - notice the lack of supports on hanging objects!
preview - notice the lack of supports on hanging objects!
I really doubt those unsupported overhanging parts are going to print. Here is the settings page for the profile.
support settings in profile
support settings in profile
Note the 45 degree setting for supports, though I'm confused about that note "only used if manual support is not defined" - no idea about that. I have to jack the "maximum overhang angle" down to 1 or 2 before I see what I consider to be genuine supports for this object. I really suspect I'm just not understanding how to define supports properly. Is this a bug, or a user error?

Is this a bug maximum overhang angle being incorrectly calculated for rotated objects, perhaps?

Thanks
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dkightley
Posts: 2405
Joined: Tue Mar 10, 2015 4:09 pm

Re: Missing Support on rotated objects?

Okay.......I believe the best way to learn is to follow what someone else does and look closely at the result of each step is. So try this......

Start with your part as you have it shown in your screen print...

1) On the Mesh menu, select Separate Connected Surfaces......all you'll see is the model list now have five entries in it
2) Click Centre and Arrange.....all the parts will now drop separately to the bed and arrange themselves neatly.
3) On the Edit dropdown, click Group Selection....this will group the five objects together so what you do next will apply to everything
4) Open the manual support window
5) Change Support Pillar Resolution to 1.0mm, and Max Overhang Angle to 10 deg...the pillar resolution is the area being inspected to determine if support is required. Have this big and you may not get support. The angle between the surface and the horizontal also is used to decide on support. Have it too steep and no support will be placed.
6) Click Generate Automatic Supports & close window

You will now have the parts set to print with a good level of support. I would recommend setting the support percentage at 20 to 25% with 2 or 3 dense top layers at 100%
Doug Kightley
Volunteer at the National Tramway Museum http://www.tramway.co.uk
Railway modeller and webmaster at http://www.talkingtgauge.net
DrBoo
Posts: 6
Joined: Wed Aug 30, 2017 7:23 am

Re: Missing Support on rotated objects?

Thanks for the assistance. With lower pillar resolution the issue was fixed.
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dkightley
Posts: 2405
Joined: Tue Mar 10, 2015 4:09 pm

Re: Missing Support on rotated objects?

Did you do EXACTLY what I suggested??? You'll save plastic and print time if you do! And you'll reduce the risk of the print falling over whilst printing!!!
Doug Kightley
Volunteer at the National Tramway Museum http://www.tramway.co.uk
Railway modeller and webmaster at http://www.talkingtgauge.net
DrBoo
Posts: 6
Joined: Wed Aug 30, 2017 7:23 am

Re: Missing Support on rotated objects?

dkightley wrote:Did you do EXACTLY what I suggested??? You'll save plastic and print time if you do! And you'll reduce the risk of the print falling over whilst printing!!!
Yep, I was previously unaware that you could split into individual isolated parts, so this was a great addition to my "toolset". I also understand the reduction in plastic and less lofty, more stable print. appreciate the assistance, thanks!

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