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Models Showcase

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 Voussoir Centring
By Krypto
Complexity
Simple
MAIN PURPOSE: Support arch blocks while the arch is built
The temporary form an arch is built on: a solid semicircular rib with foot pads, sized so nine Voussoir Wedges sit on it. Stand it up, lay the wedges from both ends, set the keystone, then slide the centring out sideways and watch the arch carry itself.
AR view Open in app
Preview of Rekenrek Frame
By Krypto
Complexity
Medium
MAIN PURPOSE: Teach counting in fives and tens with beads
A 20-bead rekenrek, the Dutch counting rack that teaches number sense in fives and tens: two rods run the length of a 260 mm tray, ten beads on each, five red and five white. Children slide groups across to see 7 as 5 and 2 at a glance. Uses 4 mm rods or bamboo skewers.
AR view Open in app
Preview of Automaton Stage
By Krypto
Complexity
Medium
MAIN PURPOSE: Turn a crank to make cam-driven figures move
The frame of a cam automaton: push an 8 mm dowel through the side holes as a camshaft, thread on three Helix Spindle discs printed at half size, and drop 6 mm dowels through the top holes so they ride on the cams. Turn the crank and the rods bob in sequence, ready to carry paper or printed figures.
AR view Open in app
Preview of Physarum Maze
By Krypto
Complexity
Multi-part assembly
MAIN PURPOSE: Watch a slime mould solve a maze
A maze for the slime mould that out-planned Tokyo’s railway engineers. Pour a thin layer of agar, put a crumb of Physarum at the start and oat flakes at the finish, and close the lid; over a few days the yellow mould explores every lane, then withdraws from the dead ends and leaves one vein along the shortest route.
AR view Open in app
Preview of Seed Crystal
By Krypto
Complexity
Medium
MAIN PURPOSE: Hang seed crystals in a jar of solution
A cap for growing crystals at home. Turn it over a wide jar of hot saturated alum, salt or sugar solution, tie a seed crystal to each of three threads through the holes and let them hang at different depths. The engraved labels keep track of which solution grows which habit.
AR view Open in app
Preview of Samara Drop
By Krypto
Complexity
Simple
MAIN PURPOSE: Show autorotation with a printed maple seed
A flying maple key. Press an M4 nut into the seed pocket, drop it from a stair or balcony and it autorotates like a sycamore seed, spinning down slowly on its single wing. Bend the trailing edge slightly to change its spin.
AR view Open in app
Preview of Strobilus
By Krypto
Complexity
Medium
MAIN PURPOSE: Read the humidity from a real pine cone
A pine cone hygrometer. Cone scales open as air dries and close when it is damp, a movement with no power or electronics. Sit a real cone in the cup against the back board and read how far its scales reach: past the WET marks, past the DRY marks, or in between.
AR view Open in app
Preview of Funicular Frame
By Krypto
Complexity
Medium
MAIN PURPOSE: Find arch and vault shapes with hanging chains
A table for finding arches the way Gaudi did. Print it, turn it over so the perforated deck is on top, hang lengths of ball chain between the holes and set a mirror underneath: every sagging chain is a perfect arch in tension, and the mirror shows it standing upright as a vault in compression.
AR view Open in app
Preview of Corbel Reach
By Krypto
Complexity
Medium (set)
MAIN PURPOSE: Stack blocks to overhang beyond the table edge
A stacking puzzle about how builders spanned before arches. Each block carries engraved marks at a half, quarter, sixth and eighth of its length: stack eight, each one set back to the next mark, and the top block ends up entirely beyond the edge of the table, held by nothing but balance.
AR view Open in app
Preview of Kamal latitude finder
By Krypto
Complexity
Simple
MAIN PURPOSE: Measure latitude from the Pole Star
The card Arab navigators used to find latitude: hold the knotted cord in your teeth, push the card out until the bottom edge sits on the horizon and the top edge touches the Pole Star. A knot for each place you know becomes a latitude scale.
AR view Open in app

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