Hollow Threaded Plastic Fitting

Create a precise, print-ready 3D model of a small hollow threaded plastic fitting, as a single watertight, manifold solid. Units: millimetres. Overall height 18.00 mm. Build it along the Z axis, with the base of the body at Z = 0 and the neck pointing up. STRUCTURE (bottom to top): 1. Lower body (Z = 0 to 8.72) - Cylinder, diameter 18.04 mm, height 8.72 mm [derived: 18 - 6.01 - 3.27; the measured 13.02 mm conflicts with the 18 mm overall height]. - 1.0 mm radius fillet around the bottom outer edge. - One vertical flat cut into the outer surface, 0.8 mm deep, running the full height of the body. 2. Flange (Z = 8.72 to 11.99) - Flat circular disc, diameter 18.18 mm, thickness 3.27 mm. - Top face smooth and perfectly flat to seat an O-ring (8.49 mm inner diameter x 2.34 mm cross-section). Do not add a groove. 3. Threaded neck (Z = 11.99 to 18.00) - Male thread, right-handed, single start. - Outer (crest) diameter 10.67 mm, root diameter 9.67 mm (thread depth 0.5 mm). - Pitch 3.64 mm [re-measure; photos suggest a finer pitch of about 1 mm]. - Height 6.01 mm, with a 0.4 mm chamfer at the top edge. 4. Interior - A single straight through-bore, diameter 8.22 mm, running the full 18 mm height. This leaves a body wall of about 4.9 mm and a neck wall of about 1.2 mm at the thread root. - Internal cross-bar at the bottom of the bore: a flat bar 1.5 mm thick and 1.5 mm tall, spanning the full bore diameter (8.22 mm) and fused into the wall. The bore remains open on both sides of the bar. PRINT REQUIREMENTS: - Dimensional tolerance +/-0.1 mm. - Print orientation: body bottom on the build plate, neck up. - No supports, apart from the small overhang above the flat. - Suitable for 0.1 mm layers or finer, in PETG or clear resin. - Export as binary STL.

Parameters

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