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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 Solargraph sun-trail camera
By Krypto
Complexity
Multi-part assembly
MAIN PURPOSE: Record six months of the sun's path on one sheet of photo paper
A camera with a six-month exposure. In a dark room, curl a sheet of ordinary photographic paper round the inside of the back wall, close the lid and tape it. Strap the box to a post or railing facing the sun (south in the northern hemisphere) and leave it from one solstice to the next. When you open it, do not develop the paper: scan it. Every sunny day has burned its own arc across the sky, with the gaps showing the cloudy days, over a ghostly image of the view.
AR view Open in app
Preview of Pepper's-ghost haunted box
By Krypto
Complexity
Multi-part assembly
MAIN PURPOSE: Make a ghost appear and vanish inside a box using a hidden sheet of acrylic
A Victorian stage trick in a box. Look through the window and you see a dark little room. Switch on the tealight in the hidden side chamber and a ghost (any small figure or a cut-out picture you put beside the light) appears floating in the middle of the room, then fades away when you switch it off. A clear sheet standing diagonally across the box reflects the lit side chamber over the room behind it: the same trick, called Pepper's ghost, that makes holograms on stage and ghosts in theme parks.
AR view Open in app
Preview of Feely-box guessing game
By Krypto
Complexity
Multi-part assembly
MAIN PURPOSE: Guess hidden objects by touch while the audience watches through the back window
Put something mysterious inside: a peeled grape, a pine cone, a toy dinosaur, cold spaghetti. The guesser reaches in through the two arm holes and has to name it by touch alone. The audience can see everything through the window at the back, and their faces are half the fun. It also builds vocabulary and touch skills for young children, and the lid keeps the next surprise hidden.
AR view Open in app
Preview of Relay-proof key-fob safe
By Krypto
Complexity
Multi-part assembly
MAIN PURPOSE: Block keyless car fobs from relay thieves with a foil-lined box
Keyless car fobs never stop talking, and thieves use a relay to pick up the signal through your front door and unlock the car outside. Line this box and its deep slip-on lid with overlapping foil tape and it becomes a Faraday cage: radio waves cannot get in or out. Drop the fobs in at night and test it by trying the car door with the fob inside. NO SIGNAL is raised on the lid.
AR view Open in app
Preview of Phone-cam bird feeder
By Krypto
Complexity
Multi-part assembly
MAIN PURPOSE: Feed garden birds while an old phone films them close up
Smart bird feeders with cameras cost a fortune; this one uses the old phone in your drawer. The seed tray sits in front of a covered garage where the phone stands with its camera behind a wide window, about a beak's length from the birds, and the lid keeps the rain off. Start a motion-triggered camera app, and you get close-up videos of every robin, tit and squirrel that visits. SMILE is on the front.
AR view Open in app
Preview of Tortoise fridge-hibernation box
By Krypto
Complexity
Multi-part assembly
MAIN PURPOSE: Hibernate a tortoise safely in a vented box in a dedicated fridge
Many reptile vets now recommend hibernating Mediterranean tortoises in a dedicated fridge, because it holds a steady 5 degrees where a garage or shed swings from freezing to warm. This box sits on the fridge shelf with a bed of soil or shredded paper; the vents on both sides let fresh air in, and the lid lifts off for the weekly weigh-in and to open the door for air. DO NOT DISTURB is raised on the front.
AR view Open in app
Preview of Submarine bath-tea infuser
By Krypto
Complexity
Multi-part assembly
MAIN PURPOSE: Hang a pierced submarine of bath herbs under the hot tap
Bath tea is a pot of herbs for the bath, and this one is a little submarine. Fill the hull with oats, lavender, rose petals or chamomile, close the hatch and hang it by the ring on its conning tower under the hot tap: the water pours in through the hatch rim and out through the eight holes in the hull, smelling of the herbs, without a single petal in the bath. When the bath is full, unhook it and let it dive to the bottom to keep steeping.
AR view Open in app
Preview of Ocean-wave drum
By Krypto
Complexity
Multi-part assembly
MAIN PURPOSE: Tilt a sealed drum of beads slowly to hear surf breaking on a beach
Ocean drums are an old sound-effects trick, used in theatres and music therapy. A handful of steel beads lies inside a wide, flat drum. Tilt it slowly and the beads roll across the wave-ridged floor in a long rushing hiss, exactly like a wave running up the sand; tip it back and the wave draws away. Shake it for rain, roll it for a storm. Children love it, and it is wonderfully calming at bedtime.
AR view Open in app
Preview of Smartphone projector with focus slots
By Krypto
Complexity
Multi-part assembly
MAIN PURPOSE: Project a phone screen onto a wall through a magnifying lens
A shoebox cinema, done properly. A magnifying lens fits over the round front port, and the phone stands upright in one of four numbered focus slots inside. Moving it back a slot focuses the picture on the wall like a slide projector, with no sliding parts. The lid blacks out the box so the image is as bright as possible. Lights off, film on.
AR view Open in app
Preview of Giant matchbox keepsake
By Krypto
Complexity
Multi-part assembly
MAIN PURPOSE: Give a gift that slides out of a giant matchbox
Everyone knows how a matchbox opens, so a giant one is a gift box with a built-in moment: push the drawer and the present slides out. It is sized for jewellery, a watch, a message or tickets. OPEN ME is raised on the drawer end.
AR view Open in app

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