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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

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Preview of Salt-dance sound visualiser
By Krypto
Complexity
Simple
Others Music & audio
0
Salt-dance sound visualiser
MAIN PURPOSE: Watch salt jump into patterns on a membrane over a phone speaker
Sound is invisible until you give it something to move. Slide a phone in through the slot, stretch cling film tight over the top like a drum skin and sprinkle on a little salt. Play a tone-generator app and sweep slowly from 100 to 600 Hz: at certain notes the salt suddenly leaps into rings, stars and grids as the membrane vibrates in sections, and between them it goes still. These are the patterns, called cymatics, that Ernst Chladni showed with a violin bow in 1787.
Printing notes
38.6 cm³
Volume
47.8 g
Est. weight
3,868
Triangles

Slide the phone in face up through the slot, stretch cling film drum-tight over the top and sprinkle a pinch of salt on it. Prints as shown on its floor, no supports.

AR view Open in app
Preview of Kanizsa illusion snack trays
By Krypto
Complexity
Simple (set)
Others Geometric & decorative
0
Kanizsa illusion snack trays
MAIN PURPOSE: Set four notched trays together and a bright square appears that is not there
Put four of these round trays in a square with their notches pointing inwards and a bright white square appears between them, with crisp edges that do not exist. It is the Kanizsa illusion: your brain fills in the outline of a shape it expects to see. Fill them with snacks and watch guests swear the square is there. Cats seem to see it too: in a 2021 citizen-science study, pet cats sat in the invisible square about as often as in a real one.
Printing notes
25.4 cm³
Volume
31.5 g
Est. weight
572
Triangles

Print four. Arrange them in a square with the notches facing the middle. Prints as shown on its outline, no supports.

AR view Open in app
Preview of Socket-hung charger shelf
By Krypto
Complexity
Simple
Others Cables & charging
0
Socket-hung charger shelf
MAIN PURPOSE: Hold a charging phone on a shelf that hangs from its own charger plug
A phone charging from a low socket ends up on the floor, dangling or tripping someone up. This shelf needs no screws: the plug-in charger sits inside it, pins out through the hole in the back, and when you plug it in, the charger itself holds the shelf flat against the wall below the switch. The phone stands in the front, its cable coiled out of sight behind it. It works with UK, European and US two-pin and three-pin chargers.
Printing notes
11.7 cm³
Volume
14.5 g
Est. weight
1,656
Triangles

Push the charger's pins out through the back hole and plug it in: the charger holds the shelf against the wall. The phone stands in front. Prints as shown on its floor, no supports. Large holes in the walls may need supports or good bridging.

AR view Open in app
Preview of Ames-room illusion box
By Krypto
Complexity
Simple
Others Science & education
0
Ames-room illusion box
MAIN PURPOSE: Make two identical toys look like a giant and a dwarf through a peephole
Look through the peephole and the room looks like an ordinary box, but it is not: the back wall runs at a slant, so the left corner is twice as far away as the right. Put two identical figures in the back corners and one looks like a giant and the other like a dwarf. Move a figure along the back wall and it grows or shrinks before your eyes. It is the Ames room, invented in 1946 and used in films to make actors look tiny next to wizards.
Printing notes
251.3 cm³
Volume
311.6 g
Est. weight
3,408
Triangles

Print in white. Lay a sheet of tracing paper over the top as a ceiling to let light in. Prints as shown on its outline, no supports.

AR view Open in app
Preview of Cloud-chamber cosmic-ray base
By Krypto
Complexity
Simple
Others Science & education
0
Cloud-chamber cosmic-ray base
MAIN PURPOSE: See the trails of cosmic-ray particles in a home-made cloud chamber
Invisible particles from space pass through you every second, and this lets you see them. Put a slab of dry ice in the base, lay a 3 mm aluminium plate painted matt black on the ledge, and turn a clear plastic tub upside down on the plate with a strip of felt soaked in 99% isopropyl alcohol stuck inside its top. After ten minutes, turn off the lights and shine a torch in from the side: thin white trails appear and vanish as muons, alpha and beta particles streak through the alcohol mist, just as in the chambers that won Nobel prizes.
Printing notes
162.4 cm³
Volume
201.4 g
Est. weight
9,644
Triangles

Use gloves for dry ice and a well-aired room. Paint the aluminium plate matt black. Prints as shown on its floor, no supports.

AR view Open in app
Preview of Phone-screen photoelastic viewer
By Krypto
Complexity
Simple
Others Science & education
0
Phone-screen photoelastic viewer
MAIN PURPOSE: See the hidden stress in clear plastic as rainbows using a phone screen
Your phone screen gives out polarised light, which is half of a stress lab. Lay the phone in the bottom showing a white page, slide a piece of clear plastic in through the slot (a protractor, a CD case, a plastic fork) and put polariser film on the ledge above. Look down and the plastic lights up in rainbow bands wherever it is strained. Squeeze the fork and watch the colours race. Engineers use exactly this, called photoelasticity, to find weak spots in parts.
Printing notes
43.1 cm³
Volume
53.5 g
Est. weight
8,476
Triangles

Works with most LCD screens and many OLED ones. A sheet of polariser film or a pair of polarised sunglasses goes on the ledge. Prints as shown on its floor, no supports.

AR view Open in app
Preview of Snail-racing championship table
By Krypto
Complexity
Simple
Others Kids & play
0
Snail-racing championship table
MAIN PURPOSE: Race garden snails from the centre circle to the edge, championship style
Every July the village of Congham in Norfolk holds the World Snail Racing Championships, on a round table: the snails start in the middle and the first to reach the outer edge wins. This is the home version, with START engraved in the middle and FINISH round the edge. Line them up, say "ready, steady, slow!", and settle in. The record is two minutes for 13 inches, so bring snacks.
Printing notes
91.9 cm³
Volume
114.0 g
Est. weight
8,300
Triangles

Dampen the table before a race, mark each snail with a dab of washable paint, and return them to where you found them. Prints as shown on its floor, no supports.

AR view Open in app
Preview of Einstein-tile coaster
By Krypto
Complexity
Simple
Others Geometric & decorative
0
Einstein-tile coaster
MAIN PURPOSE: Protect the table with coasters in the one shape that tiles without repeating
In 2023 an amateur mathematician found the shape people had searched for since the 1960s: the "hat", a single tile that covers a plane completely but never in a repeating pattern. Mathematicians call it an einstein, from the German for one stone. Each coaster is one hat. Lay a set out on the table and they fit together endlessly without the pattern ever repeating. It is a conversation piece, a puzzle and a coaster at once.
Printing notes
12.5 cm³
Volume
15.6 g
Est. weight
356
Triangles

Print a dozen or more in two colours; flip some over to fill the gaps, as the real tiling does. Prints as shown on its outline, no supports.

AR view Open in app
Preview of Spider-taxi rescue box
By Krypto
Complexity
Simple
Others Sustainable living
0
Spider-taxi rescue box
MAIN PURPOSE: Catch a spider against the wall and slide a card in to carry it outside
For people who like spiders outside and want them to stay alive. Put the open box over the spider on the wall or floor, slide a postcard in through the slot just under the rim, and it runs along the grooves inside to close the box completely. Carry the spider outside, pull the card and let it go. No squashing, no legs caught under the rim, and you never have to get close.
Printing notes
22.6 cm³
Volume
28.0 g
Est. weight
5,724
Triangles

Print in clear PETG so you can see the passenger. Use a postcard or playing card as the gate. Prints as shown on its floor, no supports.

AR view Open in app
Preview of Rock-pool aquascope
By Krypto
Complexity
Simple
Others Outdoor & adventure
0
Rock-pool aquascope
MAIN PURPOSE: Look through the surface of rock pools and ponds without the glare
Ripples and reflections hide everything in a rock pool. Push this scope a little way into the water and look down the tube: the clear window at the bottom flattens the surface and the walls block the sky, so suddenly you can see crabs, anemones, shrimps and fish as if the water were glass. Hold it by the rim, and it works just as well in ponds and streams.
Printing notes
159.9 cm³
Volume
198.2 g
Est. weight
6,448
Triangles

PETG. Glue a 120 mm disc of 3 mm clear acrylic over the window with aquarium silicone. Prints as shown on its floor, no supports.

AR view Open in app

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