I've been gradually learning some CAD in order to build some models for various Very Important Things that I need to 3D print, and one facet of this hobby that I was not prepared for is the constant frustration that literally nobody else in the 3D-printer-using world has ever made a model of the object that I urgently need.

I mean, a tetrahedral-lattice-filled cuboid with a void in the middle the exact size of an E27 lightbulb, what the hell is so complicated about that?