Here are the up to date Inkscape and Openscad files:
![](https://www.dropbox.com/static/images/spectrum-icons/generated/content/content-unknown-large.png)
For the next example I'm going to make a hollow sphere and use the perforate module to make holes in it.
I made two circles in Inkscape one smaller than the other for my desired wall thickness :
![](https://infinityplays.com/content/images/2021/04/tutorial18-1.png)
Then I used Path>difference to make a ring:
![](https://infinityplays.com/content/images/2021/04/tutorial18-2.png)
Next I made a rectangle and used Path>difference again to cut it in half:
![](https://infinityplays.com/content/images/2021/04/tutorial18-3.png)
![](https://infinityplays.com/content/images/2021/04/tutorial18-4.png)
Then I added a star on layer2 for the perforation design:
![](https://infinityplays.com/content/images/2021/04/tutorial18-5.png)
I then converted both objects to paths, added more nodes, made them lines and exported the file as a dxf14 file to import into OpenScad. In OpenScad I used rotate extrude on the half circle on layer 1 to make the hollow sphere and the star on layer 2 with the perforate module:
![](https://infinityplays.com/content/images/2021/04/tutorial18-3-1.gif)
![](https://infinityplays.com/content/images/2021/04/tutorial18-6.png)
As soon as I had the star pattern lined up on the sphere where I wanted it I used difference to subtract the perforate layer from the rotate extrude layer:
![](https://infinityplays.com/content/images/2021/04/tutorial18-7.png)
Then I rendered it and saved the stl file and was ready to slice it for printing:
![](https://infinityplays.com/content/images/2021/04/tutorial18-8-1.png)