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Models shared by the SO3D.xyz community. Open any of them in the generator to see exactly how it was built, remix it, or print it as-is. Browse the model library by category

Preview of Harmonograph sand pendulum
By Krypto
Complexity
Medium
MAIN PURPOSE: Draw looping Lissajous patterns with a swinging cup of sand
Hang this cup from a Y-shaped string: two strings tied to two hooks that join into one about halfway down. The Y lets it swing at one rate side to side and a different rate front to back, so as it swings and slowly dies down the thin stream of sand traces loops, figure-eights and spirograph flowers on the card underneath. Move the knot higher or lower to change the ratio and the drawing. It is the Victorian harmonograph, made with a cup, a string and a bag of sand.
AR view Open in app
Preview of Do-I-water planter
By Krypto
Complexity
Medium
MAIN PURPOSE: Grow herbs in a planter whose own rain gauge tells you whether to water
Should I water today? This planter answers by itself. A straight-sided rain gauge is built into its side: because the tube is the same width all the way down, every millimetre of water in it is a millimetre of rain. Check it when you pass. Less than 10 mm since you last emptied it, and the pot needs a drink; over 25 mm, the rain has done the job. It stops the most common way of killing outdoor herbs, which is watering after it has already rained.
AR view Open in app
Preview of Vortex air cannon
By Krypto
Complexity
Simple
MAIN PURPOSE: Fire invisible rings of air across a room to knock over paper cups
Tap the stretchy top of this box and a spinning doughnut of air shoots out of the round hole in the side, holds together across the room and knocks over a paper cup or blows out a candle three metres away. It is a vortex ring, the same thing as a smoke ring or a dolphin's bubble ring. Fill the box with mist from a humidifier or incense (with an adult) and you can see the rings wobble through the air.
AR view Open in app
Preview of Windowsill Aeolian harp
By Krypto
Complexity
Advanced
MAIN PURPOSE: Let the wind play an eerie chord on strings stretched over a sound box in an open window
The Aeolian harp was a Romantic-era wonder: a box of strings placed in a half-open sash window that the draught plays by itself. Wind passing over a string makes it vibrate in shimmering overtones, rising and falling with the gusts, a sound Coleridge wrote a poem about. String this sound box with fishing line over its two bridges, all tuned to one low note, and lay it across an open window. On a breezy day it sings a ghostly chord without anyone touching it.
AR view Open in app
Preview of Stop-motion animation stage
By Krypto
Complexity
Medium
MAIN PURPOSE: Animate clay figures frame by frame with a phone locked in front of a mini stage
The secret of smooth stop-motion is a camera that never moves. The phone slots upright at the front of this three-walled stage and stays perfectly still while you move a clay figure a hair at a time between frames. Twelve photos make one second of animation. Tape a printed background to the back wall, add a desk lamp from the side, and you have a little film studio for clay, toy figures or paper cut-outs.
AR view Open in app
Preview of Tie-dye spiral plate
By Krypto
Complexity
Simple
MAIN PURPOSE: Twist a T-shirt into a spiral and dye six clean colour wedges on a ribbed plate
The classic tie-dye spiral needs the shirt twisted into a flat disc and squirted with one colour per wedge, which usually happens on a soggy bin bag. This plate makes it tidy. Twist the damp shirt round a fork in the centre, then lay it so the six low ribs underneath line up with your rubber bands: each wedge gets its own colour, the ribs keep the dyes from running into each other underneath, and the rim catches the drips. Unwrap it next day to a crisp six-colour spiral.
AR view Open in app
Preview of Vanishing-coin magic box
By Krypto
Complexity
Multi-part assembly
MAIN PURPOSE: Drop a coin in, shake, open the lid, and it has gone
A magician's prop with a secret in the floor. Show the empty box, drop in a coin, close the lid and give it a shake so everyone hears it rattle. Then, holding it from underneath, tilt it slightly towards you: the coin slides through a hidden slot along the floor edge straight into your palm. Shake again (silence), lift the lid, and the box is empty. Produce the coin from a spectator's ear for the finish.
AR view Open in app
Preview of Micrometeorite hunting kit
By Krypto
Complexity
Advanced
MAIN PURPOSE: Find real space dust in your roof gutter with a wash tray, a magnet sleeve and a loupe
Tonnes of space dust land on Earth every day, and in 2017 the amateur scientist Jon Larsen proved you can find it on city rooftops. Scoop sludge from a gutter, WASH it in water and pour off the mud, DRY it, then pass the MAGNET sleeve through it: most micrometeorites contain iron, so they cling to it. Pull the magnet out over the FIND bay and the grains drop free. Under a 60x loupe, look for tiny shiny spheres with a pattern of crystal stripes, 4.6-billion-year-old visitors from space.
AR view Open in app
Preview of Earwig pest-control hotel
By Krypto
Complexity
Simple
MAIN PURPOSE: House earwigs in fruit trees so they eat the aphids overnight
Earwigs are night hunters of aphids, codling-moth eggs and other pests, and fruit growers have hung straw-filled pots in their trees for centuries to keep them close. Fill this hexagonal hotel with straw, hang it open end down from a cane or branch in an apple, plum or pear tree, and earwigs move in to hide by day and hunt by night. Move it to wherever the aphids are worst. (Keep it out of dahlias, which earwigs like to nibble.)
AR view Open in app
Preview of Cube-fruit growing box
By Krypto
Complexity
Multi-part assembly
MAIN PURPOSE: Grow square cucumbers, courgettes or mini melons inside a clear box
Japanese farmers first grew square watermelons in the 1970s so they would stack in shops and fit in fridges. This clear box does the same for smaller crops. Slip a young cucumber, courgette, mini melon or even an apple into it while it is still small, rest the stem in the notch and put the lid on. As it grows it fills the box and takes its shape, coming out a near-perfect cube with sharp corners. The drain holes stop rain pooling inside.
AR view Open in app

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