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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 Pocket gold sluice
By Krypto
Complexity
Medium
MAIN PURPOSE: Pan for gold, garnets and gemstones in a stream with riffles that trap the heavy grains
A miniature version of the sluice boxes of the gold rushes. Water runs straight through the open-ended channel and carries the light sand away, while anything dense, such as black sand, garnets and gold, drops behind the six riffle bars and stays there. After ten minutes, lift it out level and wash what is trapped behind the riffles into a pan. It also works at home in a tub of water with a bag of gem-mining paydirt.
AR view Open in app
Preview of Cat-magnet desk square
By Krypto
Complexity
Medium
MAIN PURPOSE: Lure a cat off the keyboard into a square beside the laptop
Cats cannot resist a square: in a 2021 citizen-science study, pet cats sat inside squares that were only an illusion, made of four notched circles, about as often as in real ones. This low tray uses that instinct to save your keyboard. Put it beside the laptop, and the cat that would have stretched across the keys settles into the square instead, still close to you and still in the warm. The textured floor stops it sliding.
AR view Open in app
Preview of Mycelium brick mould
By Krypto
Complexity
Multi-part assembly
MAIN PURPOSE: Grow a solid brick of mushroom mycelium as a biodegradable building material
Mycelium, the root network of mushrooms, can be grown into solid shapes and is already used for packaging and insulation. Pack this mould with pasteurised sawdust or hemp mixed with oyster mushroom spawn, put the lid on and leave it somewhere dark. In about a week the white mycelium has bound everything into a light, solid brick. Pop it out, bake it at 90 degrees for an hour to stop the growth, and you have a block that is fire-resistant, insulating and fully compostable. The small vents let it breathe.
AR view Open in app
Preview of Cricket-chirp thermometer cage
By Krypto
Complexity
Multi-part assembly
MAIN PURPOSE: Keep a singing cricket and read the temperature from how fast it chirps
Crickets chirp faster when it is warm, so regularly that in 1897 the physicist Amos Dolbear turned it into a formula: count the chirps in 14 seconds and add 40 to get the temperature in Fahrenheit. (For Celsius, count chirps in 25 seconds, divide by 3 and add 4.) This ventilated cage keeps a cricket comfortable with slotted sides for air and sound, and the formula is raised on the front so the living thermometer can be read without a phone.
AR view Open in app
Preview of Footprint tracking tunnel
By Krypto
Complexity
Simple
MAIN PURPOSE: Find out what visits the garden at night from the inky footprints it leaves
Ecologists find out which animals live in an area with tracking tunnels, and this is a garden-sized one. Turn it over so the floor becomes the roof, slide a strip of white card underneath with an inked sponge across the middle and a dab of bait in the centre, and leave it along a hedge or wall overnight. Anything that walks through, such as mice, voles, shrews, beetles or slugs, steps in the ink and leaves a trail of tiny footprints on the card. In the morning, match them to an identification guide.
AR view Open in app
Preview of Marble Braille cell
By Krypto
Complexity
Medium
MAIN PURPOSE: Learn the Braille alphabet by setting marbles in the six dot positions
Every Braille letter is a pattern of raised dots in a cell two dots wide and three high. This is that cell made big enough for small hands: place a marble in each bay that should be raised and feel the letter. A is dot 1, B is dots 1 and 2, C is dots 1 and 4. The dot numbers are engraved in the floors, so sighted children, parents and teachers can learn alongside blind and partially sighted friends, and play guess-the-letter with their eyes closed.
AR view Open in app
Preview of Raindrop-size flour tray
By Krypto
Complexity
Multi-part assembly
MAIN PURPOSE: Measure the size of raindrops by catching them in flour
In 1898, the snowflake photographer Wilson Bentley measured raindrops by catching them in flour: each drop rolls itself into a little dough pellet the same size as the drop. Take the lid off in the rain for a few seconds, cover it again, and let the pellets dry for an hour. Sift them out and drop each through the gauge holes beside the tray, from 2 to 7 mm. Drizzle makes tiny pellets, a summer storm makes big ones, and you can compare showers through the year.
AR view Open in app
Preview of Archaeology dig grid box
By Krypto
Complexity
Medium
MAIN PURPOSE: Excavate buried finds square by square on a string grid, like a real dig
Real archaeologists never just dig: they lay a grid of strings over the site and record every find by its square and layer. Bury small treasures in layers of sand and soil, tie string through the eight holes to make a 3 x 3 grid, and dig one square at a time with a spoon and a paintbrush. Columns A to C and rows 1 to 3 are marked on the sides, so a find goes in the notebook as "B2, layer 1, a bone button". It teaches patience and why the position of a find matters as much as the find.
AR view Open in app
Preview of Junior forensic lab
By Krypto
Complexity
Advanced
MAIN PURPOSE: Dust and match fingerprints and unmask a pen with ink chromatography
Two classic detective techniques in one tray. Dust a glass with cocoa, lift the print with clear tape, stick it on a card and compare it with the ARCH, LOOP and WHORL patterns engraved in the bays. Then solve the mystery note: dot ink from each suspect's black pen near the bottom of coffee-filter strips, hang them from a skewer across the INK trough with their tips in water, and watch each ink split into its own bands of colour. The pen whose colours match the note is the culprit.
AR view Open in app
Preview of Scytale cipher tube
By Krypto
Complexity
Multi-part assembly
MAIN PURPOSE: Send secret messages that only a tube of exactly the same width can read
The Spartans sent secret orders 2,500 years ago with a scytale. Wind a narrow strip of paper in a spiral round the tube, write your message along it, one letter per turn, then unwind it: the letters scatter into nonsense. Only someone with a tube of exactly the same width can wind it back up and read it. The flat faces of this hexagonal tube keep the lines of writing straight, and the strip lives inside it under the screw cap. Change the width before you print and your pair of tubes becomes your own unbreakable key.
AR view Open in app

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