GRIM — Printable Duck Call (Barrel + Insert)

GRIM is a functional, field-ready 3D printable duck call. It includes a printable barrel and matching insert, and is designed to work with standard reeds and cork — no reed printing required. Just assemble, tune, and hunt. What makes GRIM different Real-use geometry tuned for volume, rasp, and control Compatible with Echo-style and BG-style single or double reed setups Press-fit insert (airtight without glue) Works for timber and open water Smooth exterior — great for sanding, painting, hydro-dip, or laser etch Insert and cork included for builders who don’t already own one Internal diameter: 15.875 mm (5/8") Recommended materials: Best choices: PETG – durable, balanced sound ASA – excellent outdoor and heat resistance Okay for testing PLA+ – not recommended for hot field environments Avoid: Flexible TPU Carbon-fiber filled filaments on tone surfaces Print settings (tested): Layer height: 0.16 mm Walls: 3–5 Infill: 20–30% (gyroid) Orientation: vertical, bell down Supports: not required