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Free Engineering and structuresArt and pattern

Three-sided pyramid

Four identical filled PLA triangles form a colourful hollow tetrahedron.

Age
10+ years
Length
approx. 80 min
Level
Easy
Where you teach
Home
Purpose
Creative
Worksheet Guide (colour) Guide (ink-saving)

Slides for the session

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How to run this session

Stages and timing
  1. Make four filled faces
  2. Tack the first two faces
  3. Build a corner from three faces
  4. Close with the fourth face
  5. Complete seam 1–2
  6. Complete seam 1–3 / Complete seam 1–4
  7. Join with complete seams — 2/2
  8. Check four orientations

What gets built

Assemble a first closed solid from four identical faces.

What it practises
  • Arrange four identical planes into a closed solid by tacking supported edges.

Success criteria
  • Four faces enclose the solid, and the model rests stably on each one.
  • Four identical, thinly filled faces; a hollow interior and six continuous seams.
  • The participant's own colour composition has a chosen display orientation.

What you need
Filament
PLA
Colours
colour shown in the illustration, colour shown in the illustration, colour shown in the illustration, colour shown in the illustration, colour shown in the illustration
Also
PLA-compatible 3D pen — 1 pc., PLA in colours of your choice — Based on the estimated amount needed, with extra, Suitable work mat for PLA — 1 pc., Printout of the face template — 1 A4 copy, Ruler — 1 pc., Ordinary paper scissors — 1 pair

Files

The files for this plan are free once you have an account. Download what you need and come back to them any time.

How did the session go?

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Version 2026-09-29 Updated 2026-09-29

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