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Adjustable Support — Parametric Two-Piece Screw Jack (1× and 2×)

Two-piece screw jack with a buttress-style helical thread. Spin the post to extend or retract the height. Bundled in two sizes: original (~Ø36, 20 mm travel range) and 2× scale (~Ø72, 40 mm travel range). Parametric OpenSCAD lets you re-render at any scale_factor. Note: the fit is slightly loose — the thread engages cleanly with about 0.5 mm radial slip per side, which makes the spin feel free rather than tight.