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Your choice: a print file (STL) for your own 3D printer – instant download – or ready-printed with shipping.

Two snakes of 24 prisms each: straight and twisted into a ball
  • Image 1: Two snakes of 24 prisms each: straight and twisted into a ball
  • Image 2: Swan and ball of 24 prisms each, with two prisms and the twist pin in front
  • Image 3: Prism with collar and recess, twist pin and the fit test

Images: 3D preview of the design

No. 67 · Twist snake made of triangular prisms with detent joints, extendable at will – print files

Twist Snake

  • Instant download (ZIP, 2 MB)
  • 4 files
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Instant download · ZIP, 2 MB · No VAT charged pursuant to § 19 UStG

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A snake of triangular prisms that twists at every joint in 90° steps. The straight bar turns into shapes like a ball or a swan. Every prism is its own module, so the snake can grow as long as you like.

In the download

  • Prisma.stl
  • Drehstift.stl
  • Platte_12_Prismen_12_Stifte.stl
  • Passprobe_2_Module.stl
Prism
legs 22 mm, depth 22 mm, hypotenuse 31 mm
Twist pin
15.2 × 9.3 × 5.7 mm, two spring arms 1.3 mm
Detent positions
4 per joint (every 90°)
Snake of 24 prisms
388 mm straight, ball 66 mm
Clearance
collar in recess 0.2 mm, pin in hole 0.25 mm
Plate
12 prisms + 12 pins, 135 × 120 mm
Format
STL, 4 files

The model

Each prism is a right isosceles triangle with 22 mm legs and 22 mm depth. One leg face carries a flat collar with four detent bumps, the other a matching recess with four dimples. Collar and recess center two prisms on each other, and the bumps click in at 0°, 90°, 180° and 270°.

Two prisms are held together by a twist pin: a flat-printed clip with two spring arms whose hooks snap behind a lip in each socket. When you twist, the bumps lift the faces by 0.3 mm, the arms spring back and pull the prisms together again in the next detent. A firm pull separates any joint again.

The pictures show snakes of 24 prisms each in two colors: straight (388 mm long), as a ball (66 mm) and as a swan (125 mm high). For a snake of 24 prisms you print the plate twice. Every additional prism and pin makes the snake 16 mm longer. The fit test (2 prisms, 2 pins) shows before the big print whether the joints click cleanly on your printer.

View print notes (German)

Print notes included in German; part names are self-explanatory.

You will need

  • 3D printer with a print area of at least 140 × 125 mm (single prism: 30 × 22 mm)
  • Filament in two colors

Printing

Orientation
prisms on the long face (hypotenuse), pins flat – as in the files
Supports
none; the sockets sit at 45° and support themselves
Layer / nozzle
0.2 mm / 0.4 mm
Material
PETG recommended (the pins spring)
Colors
prisms alternating in two colors, red and white in the pictures; pins any color

Notes

  • To assemble, press the pin into a socket until it clicks, then push on the next prism. Not suitable for children under 3 years (small parts that can be swallowed).
  • The files are for your private use – print them as often as you like. You may not pass on, upload or sell the files themselves.

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