Piggy Bank — top coin slot + finger-twist bottom plug

A classic chubby piggy bank standing on four little trotters. Drop coins

in through the slot on top — they fall into the hollow body. Empty it by

unscrewing the bottom plug, whose **knurled rim you twist with your

fingers** (no tool needed), recessed in a pocket between the feet.

The whole pig is one print (snout, ears, curly tail, feet, top slot and

the internal threaded collar are all integral) plus a separate screw plug.

What's in this listing

| STL | What | Print pose |

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

| piggy_bank_body.stl| The whole pig | belly-down (flat belly between the feet = bed) |

| piggy_bank_plug.stl| Knurled screw plug | knob-down |

Both are watertight single bodies — no supports. The flat belly (hidden

between the feet) is the print base; the four feet and the snout bump all sit

at or narrow toward the bed, so nothing overhangs.

Suggested: 0.2 mm layers, 3 perimeters, 12–15 % infill, PLA.

Using it

1. Feed it. Drop coins into the slot on the back/top. It takes coins up to

2.    Ø33 mm (US half-dollar 30.6, AU 50c 31.5, €2 25.75, UK £2 28.4 …) —

3.    essentially any circulating world coin.

4. 2. Empty it. Turn the pig over and unscrew the plug with your fingers —

5.    the belly pocket has three big finger-scoops so you can pinch the knurled

6.    knob and twist. The inside floor is a funnel that feeds every coin to

7.    the hole, so they tip straight out; screw the plug back in.

Parametric source

The OpenSCAD .scadis included. Key knobs at the top of the file:

• coin_d/ coin_t— top slot size (default Ø33 × 3.2)

• - body_l/ body_w/ body_h, wall— pig size + shell thickness

• - foot_d, foot_x, foot_y— foot size + stance

• - thr_d, thr_p, thr_len, thr_clear— screw thread (Ø38, 4 mm pitch);

•   if the plug is tight raise thr_clear, if loose lower it

• - knob_d, pocket_d, pocket_h, finger_d— finger knob + pocket + scoops

• - funnel_rise— how steeply the inside floor funnels to the hole

Fork it, change the size, share what you make.