TPU Laundry Detergent Dosing Ball (150 ml)

Leak-Proof TPU Laundry Detergent Dosing Ball (150 ml) Tired of hard plastic dosing cups cracking, rattling loudly in the washing machine drum, or leaking sticky detergent on your counter? This dosing ball is designed from the ground up for TPU 95A. It is flexible, silent in the machine, completely watertight, and prints cleanly with zero supports. ────── Features & Design Details • 100% Watertight Geometry: The wall is an exact multiple of a standard 0.4 mm line width (2.4 mm = 6 perimeters). Your slicer fills it entirely with concentric loops, leaving zero gap-fill voids or pinholes. • Dual Volumetric Markings (50, 75, 100, 125, 150 ml): • Exterior: Embossed numbers and ticks (+0.8 mm). • Interior: Tactile indicator rings so you can see the fill level easily from above. • Full Wall Integrity: Markings only add material (+0.8 mm outer emboss / inner ridges) — nothing is engraved into the wall. • Mathematically Calculated Capacity: Dose levels were derived by numerical integration of the inner cavity volume inside OpenSCAD (verified < 0.1 ml error). • Support-Free: All overhang angles are 45° or less. • Tumble & Squeeze Proof: Features a 4 mm internal stress-relief fillet at the bottom and a reinforced 3.2 mm rounded bead at the opening to keep its shape. ────── Dimensions & Specs • Dimensions: Ø 76.8 mm × 74.8 mm height • Capacity: 150 ml to MAX line (~186 ml to shoulder / ~196 ml brim-full) • Wall Thickness: Constant 2.4 mm (6 perimeters) • Filament Used: ≈ 50 g (≈ 41 cm³ TPU) ────── Filament Prep (Crucial for Watertight Prints) • Dry your TPU: Wet TPU is the #1 cause of leaking prints. Dry at 55 °C for 6–8 hours before printing. Moisture leads to micro-foaming and pinholes. • Direct Drive / External Spool: Feed directly from an external spool holder or drybox (do not use AMS / MMU systems for soft TPU). ────── Recommended Slicer Settings (PrusaSlicer / OrcaSlicer / Bambu Studio) • Orientation: Upright, opening on top • Supports: None (No brim needed) • Layer Height: 0.20 mm • Perimeter Generator: Arachne • Perimeters / Wall Loops: 6 to 7 (or 100% solid infill) • Seam Position: Rear / Aligned (enable Scarf Joint Seam if your slicer supports it to eliminate seam pinholes) • Extrusion Multiplier / Flow: Your calibrated flow + 3% to 5% (slight over-extrusion fuses perimeter lines together) • Nozzle Temp: 235 °C – 240 °C (higher heat ensures maximum layer adhesion) • Part Cooling Fan: 20% – 30% • Speed: Keep volumetric speed low (≈ 3–4 mm³/s for standard TPU 95A) ────── Pre-Wash Leak Test Before placing it in your laundry routine: - Fill with water to the 150 ml MAX line.

- Place on a dry paper towel for 30 minutes.

- Squeeze the ball firmly.

- If you notice any weeping: increase nozzle temp by +5 °C, bump extrusion flow by +2%, and check your seam settings. ──────

Parametric OpenSCAD Source The model was generated parametrically in OpenSCAD (dosing_ball.scad). All dimensions, line widths, wall thicknesses, and volume marks can be customized if you need a different capacity.