I have several 3-D parts that must end up as clean, watertight STL files ready for immediate slicing and print. The original geometry was started in Open DCAD, so I want to keep that workflow consistent—script-based parametric edits, quick re-generations, and repeatable version control. Here is what I need from you: • Review the existing Open DCAD source (or create fresh code if starting from scratch) and ensure every solid is manifold, with no non-planar faces or self-intersections. • Export final STLs that pass Cura, PrusaSlicer, or similar checks without repair. • Document any parameters you add or change so I can tweak dimensions later. If you prefer to model in AutoCAD, SolidWorks, Fusion 360, or another CAD package first, that is fine as long as the end result is a compatible Open DCAD file and production-ready STL. I will supply sketches, reference photos, and target dimensions once we start; you return the Open DCAD script and each corresponding STL. Turnaround on the first iteration is important to keep prototyping on schedule, so clear communication and incremental previews (screenshots or low-res STLs) will help speed approvals.