Coin-toss bell-curve tower — 3D-printable model preview

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Tabletop gaming & play Advanced

Coin-toss bell-curve tower

Watch a bell curve build up, one bead for every shake of eight coins

Shake eight coins in the front tray, count the heads, and drop a bead into that column, from 0 to 8. Do it fifty times and the beads build a bell curve you can see through the clear walls: 4 heads stands tallest because there are 70 ways to get it, 3 and 5 come close behind, and 0 or 8 heads almost never happens (1 way in 256). It is the binomial distribution, the maths behind the famous Galton board, built by hand one shake at a time.

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Size (Base A): 215 × 30 × 170 mm
Shape: Rectangular
Walls: 2.4 mm
Volume: 154 cm³
Est. weight (PLA): 191 g
Parts to print: 1
Category: Tabletop gaming & play
Made by: Krypto
Built in: 50 steps

What’s in it

Rectangular, 215 × 30 × 170 mm, with 2.4 mm walls
8 dividers
Raised text: “HEADS”
2 more bases built on (Bases B–C)
Base B: rectangular, 215 × 50 mm, 10 mm tall (beside)
Base C: rectangular, 215 × 70 mm, 22 mm tall (beside)

How to print it

Print the tower in clear PETG so the beads show; use 8 mm beads. Shake the coins in the front tray; the back foot keeps it steady.

Prints as shown on its floor, no supports.

Filament: at most about 191 g of PLA printed solid (roughly $3.82 at $20 per kg); normal infill uses less.

To get the files, open it in the generator and choose File › Download STL (one file per part) or Download 3MF (every part on one plate).

Questions

What size is the coin-toss bell-curve tower model?

The coin-toss bell-curve tower model measures 215 × 30 × 170 mm (width × depth × height). That is Base A; 2 more bases are built on. You can change every size in the free SO3D.xyz generator before you download it.

Does it need supports?

No. Print the tower in clear PETG so the beads show; use 8 mm beads. Shake the coins in the front tray; the back foot keeps it steady. Prints as shown on its floor, no supports.

How much filament does it use?

At most about 191 g of PLA (154 cm³ printed solid), roughly $3.82 of filament at $20 per kg. Normal infill uses less.

Can I change it?

Yes. Open it in the SO3D.xyz generator (free, in your browser), change the size, walls, dividers, holes, text or anything else, then download it as STL or 3MF for your slicer.

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Make it fit your space

Change the size, walls, dividers, holes and labels of the coin-toss bell-curve tower model in your browser, then download it for your printer. Free, no CAD needed.

Customize this model