Lip-Held Whistle Body

// ======================================================== // COMPACT LIP-HELD WHISTLE CANDY — max whistle strength // Not tuned to a specific frequency — optimized for a // loud edge tone via a small throat + sharp step + wide // resonance chamber, with an engraved grip groove. // Units: millimeters (mm) // ======================================================== $fn = 150; // --- Core tube dimensions --- tube_length = 28.0; // overall body length tube_dia = 18.0; // main body diameter (increased for wall strength — acoustics unaffected, set entirely by throat/chamber below) // --- Grip groove (engraved bite/lip channel) --- // A recessed channel is structurally safer than a raised flange: nothing // sticks out to shear off under bite force, teeth/lips settle naturally // into the concave channel, and it's undercut-free to mold/release. groove_depth = 1.5; // radial depth cut into the wall groove_radius = 1.6; // cross-section radius of the grooving tool (sets width ~3.2mm) groove_pos = 4.0; // sits in the inlet taper, where the bore is already narrowing — // wall here is thick, so the groove doesn't undercut it much // --- Inlet taper (smooth jet acceleration into throat) --- inlet_length = 5.0; inlet_start_dia = tube_dia; // --- Throat (jet formation — smaller = faster jet = louder) --- throat_dia = 1.8; throat_length = 1.8; // ~1x throat diameter, just enough to stabilize jet // --- Resonance chamber (sharp step edge = edge-tone generator) --- chamber_length = tube_length - inlet_length - throat_length; // 21.2 mm chamber_dia = 9.0; // wide relative to length = more volume = louder module whistle_body() { cylinder(h = tube_length, d = tube_dia, center = false); } module grip_groove() { // Torus cut into the outer wall at groove_pos, forming a rounded // engraved channel for teeth/lips to sink into translate([0, 0, groove_pos]) rotate_extrude() translate([tube_dia/2 - groove_depth + groove_radius, 0]) circ

Parameters

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