Blender tutorial on Proximity effect in Geometry Nodes. Step-by-step guide, explaining each node and related parameters.

Or, using these models and sending them over to a 3D printer straight from Blender itself. Not bad for free software!

Blender, an open source integrated 3DCG production ... expanded functionality for geometry nodes, faster rendering engine, and practical improvements. One of the new additions in version 4.4 ...