There are a few published modules for the latter and I have an unpublished one I prefer. You can either derive the cross section for your thread profile (can be done with OpenSCAD code) then linear_extrude it with twist (needs really fine division to be accurate though) or skin a polyhedron for the thread. Note that there's no canonical module for doing threads in OpenSCAD. You just have to decide how to size and position them for your model yourself. as well as (union) attaching external threads. You can use CSG operations (intersection or difference) to cut the model, cut a compartment out of it, cut threads in it, etc. On the other hand, doing it manually is rather easy. So automation of this entirely in OpenSCAD is really not an option. It has a decent functional language for expressing geometry in terms of parameters and functions/modules, but the road is one way geometry is an output only and doesn't loop back into input. OpenSCAD is a unique entry in the CAD software realm. OpenSCAD lacks any facilities to perform computations on the resulting geometry (derived from CSG or directly imported). I'm thinking a few simple yet potent lines of OpenSCAD code or a FreeCAD script should do the trick but my knowledge is limited in this field at the moment so any input is highly appreciated. a cylindrical hidden compartment or a space where specific user-made modules fits into) Make a hollow compartment inside the model with working 3D-printable threads sticking out from one part fitting into the other with definable shape, tolerance & size in relation to the parts size (eg. slicing a model in half & keeping both parts separate) Split any given model at X height with Y angle Z times (eg. So I thought the best way of achieving this in a streamlined semi-automated manner is creating a simple script in OpenSCAD / FreeCAD and I would love some professional input on how to achieve this exact process: secret compartments, modules like salt/pepper shakers, etc. FreeCAD has had several, separately developed, systems (implemented as workbenches) for making assemblies of multiple parts over the years, with different philosophies, and therefore, different strengths and weaknesses. I had a thought the other day that it's 100 % waste to have either a solid or hollow 3D-printed model in relation to utilizing the space inside of it for different modules, e.g.
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