![]() ![]() What I'm going to walk you through here is a way to create helical thread forms just like the ones you'd strip when overtightening a bolt: In short, what we don't want is unnecessary structure, gaps, holes and mismatch of resolution of the threads and the rest of the geometry. geometry matched to the rest of the model.low polygon count and accurate / efficient reproduction of the thread profile.regular mesh / regular connectivity of trangles / quadrilaterals (no crazy pointy aspect ratios and cell size changes).manifold additive threads (demonstrated here, imho more universal)."embossed threads" on a curved surface or.stl export to the slicer tool deserves a little bit of attention. While the core idea of a straight thread - the helical profile wrapped onto a cylinder - is rather straight forward, generating nice geometry that does not disintegrate along the way from model rendering thru. Only right-hand threads are supported but left-handed threads are easy to get by applying mirror() to the output. Shown below are single start inside and outside threads as well as a swivel nut with a "faster" 3-start thread, all modelled to match commercial water bottles - the small one is "PCO-1881" known from 1.5L soda bottles, the larger one is "48-41" for 3-5L jugs: The generalized approach presented here supports arbitrary thread geometries and numbers of starts. Unlike gears that invariably wear rapidly and cannot measure up compared to cast or subtractively machined parts, they are pretty functional and allow the common maker to interface with custom and standardized bolts, pipes, valves, soda bottles and canisters - and that's on top of the liberty to create your own threaded mating components within the confines of your design. 3D printing internal and external threads is interesting for many reasons. ![]()
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