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yesbird
Posts: 9
Joined: Wed Feb 26, 2020 8:24 am
Location: Russian Federation
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Bottom solid layer on perimeter

Wed Feb 26, 2020 8:48 am

Hi, guys !

Thank you very much for great software you are doing - best on the market - do doubt.

Doing my first project I have got an issue similar to described at viewtopic.php?t=9847, but I have 4.1.2 release.
Model is attached, unfortunately can not attach factory file - it's too large (6 Mb zipped) .

Could you please help me to get rid of unwanted solid layer segments inside the perimeter ?

Thanks in advance.
Attachments
Coffee_cup_01_ZBrush_fixed_hollow.zip
(2.52 MiB) Downloaded 12 times
Solid_on_perimeter_settings.png
Solid_on_perimeter.png

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dkightley
Posts: 2171
Joined: Tue Mar 10, 2015 4:09 pm

Re: Bottom solid layer on perimeter

Wed Feb 26, 2020 11:19 am

The slicer is resolving the need to have three "bottom layers" at the points where there's a dint below a bump in the side.

Try this:

Use the Variable Settings Wizard to create a settings split just above the three bottom layers.
Leave the lower profile as is.
Remove the Bottom layers from the upper profile.
Doug Kightley
Volunteer at the National Tramway Museum http://www.tramway.co.uk
Railway modeller and webmaster at http://www.talkingtgauge.net

User avatar
yesbird
Posts: 9
Joined: Wed Feb 26, 2020 8:24 am
Location: Russian Federation
Contact: Website Facebook

Re: Bottom solid layer on perimeter

Wed Feb 26, 2020 12:48 pm

Thank you very much for suggestion, splitting process done the trick !

But don't you think that default behaviour is little bit strange ? I mean that 'bottom' layers should always be at the bottom.

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dkightley
Posts: 2171
Joined: Tue Mar 10, 2015 4:09 pm

Re: Bottom solid layer on perimeter

Wed Feb 26, 2020 5:23 pm

I don't consider the default behaviour strange. Take a look at this simple shape:
Capture.JPG
I hope you agree that face A is the very top of the model....made up of the "TOP" layer. You should also agree that face D is the very bottom of the shape.....made up of the "BOTTOM" layer.

What about Face B? and Face C?

Face B is a top layer....and you would expect the Number of Top Layers setting to define exactly the same number of layers as at the very top to get a smooth finish. Similarly, Face C is a bottom layer where you would expect the same number of layers as at the very bottom as per the Bottom layers setting.

Now....my shape is a simple and straight-forward shape with well-defined upward and downward facing "flats". Your shape has a few very thin downward facing "flats"...if you consider a sloping face to be a "staircase"....and the same rules that apply to my shape are being applied to yours. And using two profiles is the natural way to stop the "accidental" creation of bottom layers where you don't really want them.

btw.....other changes would also achieve the same result (eg more perimeters, thinner layers, smaller nozzle, etc)
Doug Kightley
Volunteer at the National Tramway Museum http://www.tramway.co.uk
Railway modeller and webmaster at http://www.talkingtgauge.net

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yesbird
Posts: 9
Joined: Wed Feb 26, 2020 8:24 am
Location: Russian Federation
Contact: Website Facebook

Re: Bottom solid layer on perimeter

Thu Feb 27, 2020 9:16 am

Thank you very much for detailed explanation - it is very informative, but I am trying to figure out how the algorithm works and how can I get more precision control on it - just for fun and to get better results. Unfortunately I can not look at your sources :) 

For the first view situation is little bit confusing: bottom solid layers is set to 3 but I see much more solid layers in preview, so what is "bottom layer" definition ?

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