Lemon / Citrus Hand Squeezer — Reamer + Strainer Cap + Pour Spout

A two-piece manual citrus squeezer — print both parts, drop the

cap on the bowl, and you have a hand juicer with a strainer and a

pour spout.

How it works

• Cap = strainer disc + swirly helical reamer cone. The cone

•   is a linear_extrude(twist, scale)of a cosine-wave star polygon,

•   giving sharp helical ridges with a smooth wavy outer profile. Half

•   a turn of twist from base to tip means as you twist a lemon-half

•   onto the cone, the spirals shear the flesh and direct juice down

•   the ridge channels.

• - Strainer: a ring of 24 × Ø3 mm holes drilled straight through

•   the cap's solid puck floor. No bridges, no supports — just a

•   perforated disc.

• - Bowl: 95 mm outer Ø × 50 mm tall cylindrical juice cup with a

•   tapered U-trough pour spout punched through the rim. The

•   trough's cavity floor is at the bowl's juice level so juice flows

•   out the moment you tilt.

• - Cap → bowl seat: the cap's outer lip is a full-height conical

•   flare (Ø89 → Ø93 over 6 mm) that nests into a matching chamfer at

•   the bowl rim. Slope-matched 1:1 so the cap seats face-to-face along

•   the entire lip, not on a knife-edge inner corner. **Slight

•   interference at the bead** lets the cap stow upside-down INSIDE

•   the bowl when not in use — a press-fit storage trick.

• - Lemon-peel dimple texture on the bowl's outer wall (skipped

•   in the spout sector so the trough stays smooth).

Parts & files

| File | Print | Orientation |

|---|---|---|

| bowl.stl| bowl + integrated spout | floor on bed, spout pointing sideways |

| cap.stl| strainer + reamer cone | strainer disc on bed, cone pointing UP |

| lemon_squeezer.scad| parametric source | edit any dimension and re-export |

No supports needed for either part. The cone tip at top is the

print-finish point; no overhangs > 45° anywhere.

Printing

• 0.2 mm layers, 3 walls, 15 % infill is plenty (the bowl is mostly

•   hollow, the cap is mostly cone).

• - Yellow PLA is the obvious aesthetic choice — looks like a

•   lemon. Any food-contact PLA grade works for short use; rinse +

•   hand-dry between uses (FDM layer lines are not dishwasher-safe and

•   trap residue if soaked).

• - Print both parts at once on a 220 × 220 bed; total weight ≈ 50 g.

Use

1. Cut a lemon (or lime / small orange) in half.

2. 2. Drop the cap onto the bowl rim.

3. 3. Cut-side down on the cone, twist + press hard.

4. 4. Juice flows through the ridges, through the strainer holes, into

5.    the bowl. Pulp + seeds stay on top of the cap.

6. 5. Lift the cap off, pour from the bowl spout.

7. 6. Rinse both parts, snap the cap upside-down into the bowl for

8.    storage.

Tweaking the SCAD

The OpenSCAD source is included. Useful knobs at the top:

• bowl_outer_d(95 mm) — bowl diameter; scale up for grapefruit

•   halves, down for limes.

• - bowl_h(50 mm) — juice volume.

• - cap_cone_h/ cap_cone_d_base— reamer aggression; taller cone

•   + bigger base = more juice extraction per twist.

• - n_strainer(24) / strainer_hole_d(3 mm) — strainer hole count

•   + size.

• - spout_proj(24 mm) — how far the pour spout projects past the

•   bowl wall.

The partswitch at the top of the SCAD selects what to render —

"bowl", "cap", "all"(assembled), "exploded", or "section"

(half-cut for inspecting the cap-bowl seat).