Small Pineapple Luban Lock (小菠萝): Take-Apart 3D & STL
Small pineapple burr
The small pineapple is a nine-piece lock: three long sticks cross at the centre, and six short sticks sit around them, each short biting one long.
Build the three longs into a 3-D cross first; seat the shorts one by one. Late in the build one long must slide aside so a short can enter, then slide back before the last short locks.
- Pieces
- 9 (3 long + 6 short)
- Key
- One long pulls straight out first when assembled
- Kind
- Folk pineapple family
Small pineapple, assembled.
Drag to orbit; scrub the slider to take it apart.
How it works
How it works
When assembled, only the key stick pulls straight out; the rest follow in order. Interactive take-apart and free STL are below.
Free STL downloads
- Assembled lock (one file, preview only) pineapple-small-assembled.stl
- All nine pieces (tray layout) pineapple-small-pieces-tray.stl
- Piece A (long, 8 u; 18 voxels) pineapple-small-a.stl
- Piece B (long, 8 u; 20 voxels) pineapple-small-b.stl
- Piece C (long, 8 u; 19 voxels) pineapple-small-c.stl
- Piece E1 (short, 4 u; 11 voxels) pineapple-small-e1.stl
- Piece D1 (short, 4 u; 12 voxels) pineapple-small-d1.stl
- Piece F1 (short, 4 u; 13 voxels) pineapple-small-f1.stl
- Piece D2 (short, 4 u; 12 voxels) pineapple-small-d2.stl
- Piece D3 (short, 4 u; 12 voxels) pineapple-small-d3.stl
- Piece E2 (short, 4 u; 11 voxels) pineapple-small-e2.stl
Print one of each of the nine. Suggest 8–10 mm/u with about 0.2 mm clearance. Licence CC BY 4.0. See the CNC and 3D-printing notes.
Questions
How many pieces?
Nine: three long and six short.
Relation to 大菠萝?
Same folk family; the large pineapple is usually counted at 33 pieces and is listed on the hub without a printable model yet.
Further reading
- 小菠萝 nine-piece tutorial (3 long + 6 short), jxknma
- STL licence CC BY 4.0 (榫卯图志); assembly checked by tools/pineapple_small_solve.py