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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 Tissue in-and-out box
By Krypto
Complexity
Multi-part assembly
MAIN PURPOSE: Pull clean tissues from the top and post used ones into a flap bin on the side
Every cold ends with a mountain of used tissues on the bedside table. This box solves both halves of the problem: clean tissues pull out of the slot in the top, and used ones go straight through the swinging flap of the bin built onto its side, out of sight. The bin lid lifts off for emptying. CLEAN and USED are raised on the fronts, so nobody gets them mixed up at 3 a.m.
AR view Open in app
Preview of Electrolysis rust-removal tank
By Krypto
Complexity
Medium
MAIN PURPOSE: Strip rust off old tools overnight with washing soda and a battery charger
The restorer's secret for rusty tools. Fill the tank with water and a tablespoon of washing soda per litre, slide scrap steel plates into the slots at each end and connect them to the + clip of a 12 V battery charger. Hang the rusty tool from a rod through the two top holes and connect it to the - clip. Tiny bubbles start at once, and by morning the rust has turned to loose black flakes that wipe off, leaving the clean metal and even the stamped markings underneath untouched.
AR view Open in app
Preview of Parabolic Wi-Fi booster
By Krypto
Complexity
Simple
MAIN PURPOSE: Beam a router's Wi-Fi towards the room that needs it with a foil-lined parabola
A router sprays its signal in every direction, half of it into the wall or the neighbours. Stand its antenna through the hole in this dish, which sits exactly at the focus of the parabolic back wall, line the curve with foil, and the reflector sends that wasted half forward towards the room you aim it at, often adding a couple of bars there. The same geometry works for sound: stand a phone at the focus and its music is beamed forward too.
AR view Open in app
Preview of Roman wax-tablet notepad
By Krypto
Complexity
Multi-part assembly
MAIN PURPOSE: Write and erase notes on a wax tablet with a stylus, as Roman scribes did
Two thousand years before sticky notes, Romans wrote shopping lists and school sums on wax tablets: scratch letters into the wax with a pointed stylus, then smooth them away with the flat end and start again. Pour coloured beeswax into the tray, keep the stylus in its groove, and slip the lid on to protect it. Warm the wax with a hairdryer to wipe the whole page clean. Endlessly reusable, and oddly satisfying to write on.
AR view Open in app
Preview of Break-glass emergency chocolate box
By Krypto
Complexity
Simple
MAIN PURPOSE: Keep a chocolate bar behind "glass" for genuine desk emergencies
IN CASE OF EMERGENCY, BREAK GLASS. Mount it by the desk with a chocolate bar (or a spare phone charger, or headache tablets) displayed behind the window. The "glass" is a sheet of clear plastic that slides in behind the front, so in a real emergency, such as a Monday, a deadline or a meeting that should have been an email, you just lift it out. A great gift for anyone who has ever said "I need chocolate".
AR view Open in app
Preview of Strawberry DNA extraction lab
By Krypto
Complexity
Advanced
MAIN PURPOSE: Pull visible strands of DNA out of a strawberry with soap, salt and cold alcohol
You can see DNA with your own eyes. MASH a strawberry in a bag with a spoon of washing-up liquid and a pinch of salt (the soap breaks open the cells, the salt clumps the DNA), pour it through a coffee filter in the FILTER cup, then pour the juice into a test tube in the rack. Trickle ice-cold rubbing alcohol down the side of the tube: a white, cloudy, stringy layer rises up through it, the strawberry's DNA, which you can spool out on a stick in the STIR bay.
AR view Open in app
Preview of Buffon's-needle pi tray
By Krypto
Complexity
Medium
MAIN PURPOSE: Estimate pi by dropping matchsticks on a tray of parallel lines
In 1777 the Comte de Buffon found a way to work out pi with nothing but sticks: drop sticks as long as the gap between parallel lines, and the chance that one lands across a line is exactly 2 divided by pi. Drop 40 mm sticks onto this tray, which has raised lines exactly 40 mm apart, count how many you dropped (N) and how many cross or touch a line (C), and pi is about 2N divided by C. A hundred drops gets close to 3.1; a whole class pooling results gets closer still.
AR view Open in app
Preview of Zhang Heng earthquake ball
By Krypto
Complexity
Medium
MAIN PURPOSE: Detect a tremor when a marble balanced on a slender column falls into the dish
In 132 AD the Chinese astronomer Zhang Heng built the first seismoscope: eight bronze dragons each held a ball, and a tremor made one drop its ball into the mouth of a bronze toad, clanging the alarm and showing the direction of the quake. This is the one-dragon version. A marble sits in a shallow cup on top of a tall, slim screw-in column; a door slam, heavy footsteps or a real tremor tips it off and it lands in the dish with a clatter. Place it on different floors and see which part of the house shakes most.
AR view Open in app
Preview of Monty Hall three-door game
By Krypto
Complexity
Multi-part assembly
MAIN PURPOSE: Play the famous probability puzzle with three lidded boxes, one prize and two duds
You pick one of three doors. The host, who knows where the prize is, opens another door to show a goat, and asks: do you want to switch? Most people say it makes no difference. It does: switching wins two times out of three. Even mathematicians argued about it when it was published in 1990. Hide a prize in one of these three numbered boxes and test it at the table: play twenty rounds each way and the tally does not lie.
AR view Open in app
Preview of Woodlouse choice chamber
By Krypto
Complexity
Medium
MAIN PURPOSE: Let woodlice choose between damp, dry, light and dark, and count where they go
A classic biology experiment. The four bays meet at an open centre: DAMP and DARK, DAMP and LIGHT, DRY and DARK, DRY and LIGHT. Release ten woodlice in the middle, cover the top with cling film, shade the DARK half with card and wait ten minutes. Almost all of them end up in the damp, dark bay, because woodlice are crustaceans that dry out quickly and hide from the light that would show them to birds. Count them, swap the conditions round and try again, then return them to where you found them.
AR view Open in app

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