Bit of a modelling novice in Moi. Just purchased.

Any moi experts able to give some general guidelines if I want to model a hollow octahedron?

Have you an image of what do you want exactly because Goolge images gives a lot of different things for "Hollow Octahedron"! :)

So what is yours ?

Hi shamus, probably the easiest way is to start with using Draw curve > Rect to draw a square. Then use Construct > Extrude with the "To point" option to make a Pyramid solid from the square. Then use Transform > Mirror to make a mirrored copy of the pyramid along its base line. Next select both pyramids and use Construct > Boolean > Union to combine them together into an octahedron. To hollow out the interior of the octahedron select it and use Construct > Offset > Shell and enter in your desired wall thickness.

Let me know if you get stuck on any of these steps.

- Michael

You can also find a bunch of pre-made geometric shapes on grabcad.com, like this one:
https://grabcad.com/library/basic-geometric-shapes-3d-1

Also check out this page which has a bunch of polyhedron objects in 3DM format that you can download and import into MoI:
http://www.rhino3d.nl/pythposter/pyth3dm-eng.html

- Michael