Material handling (Conveyors systems, packaging.Material handling and lifting equipment.
Banners on the TraceParts CAD-content platform The LEGO Parts/Sets/Colors and Inventories of every official LEGO set in the Rebrickable database is available for download as csv files here.
For personal projects, I have been having a great time with using FreeCAD, a very capable and feature-full parametric modeler.
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