SnipFold

Faceted Horn Gramophone

Original static paper gramophone with a square cabinet, layered record, fixed box crank, supported L elbow and two-stage square flared horn.

Materials

  • 200-240 gsm cardstock
  • Scissors or craft knife
  • Ruler and scoring tool
  • PVA paper glue

Finished size: 130 x 116 x 129 mm

Steps

CutValley foldMountain foldGlue area

  1. Build the square cabinet

    Print at 100%; check the 50 mm ruler. Cut each part once. Use 200-240 gsm card. C1 is the 100 x 100 mm bottom; C2 front, C3 right, C4 rear, C5 left, C6 top. Score every tab hinge. Fold the 4 mm laps inward 90 degrees and glue under matching panel edges. Build walls around C1, close vertical seams, then fit C6 at height 32 mm. Hold square and dry fully. Coordinates for later placements: front y=-50, right x=50; all distances in mm.

  2. Laminate the fixed record

    Glue P flat on C6 with center 58 mm from the left edge and 38 mm from the front edge. Glue R concentrically onto P, then L onto R. Diameters are 64, 58 and 18 mm. These are face-glued paper layers, not a spinning turntable. The preview omits their thickness.

  3. Build and mount the horn column

    Assemble S1-S6 as a closed 14 x 14 x 38 mm column using its 3.5 mm laps, folded 90 degrees inward. S1 is the bottom and S6 the top. Coat the entire S1 underside with glue. Mount on C6: left edge 11 mm from cabinet left, front edge 71 mm from cabinet front. The footprint is x=-39 to -25, y=21 to 35; top height is 70 mm. Dry upright before loading.

  4. Form the supported box elbow

    E1 and E2 are the L-shaped cheeks. Join them with E3-E7 in boundary order: bottom, inner upright, inner horizontal, top, outer upright. Fold 3 mm laps inward 90 degrees. Leave the square outlet at x=-12 open. Glue the full 14 x 14 mm E3 bottom onto S6. Match x=-39 to -25 and y=21 to 35 exactly. Elbow rises to z=98; outlet center is (x=-12,y=28,z=91). Let both column and elbow joints dry before adding the horn.

  5. Assemble the two-stage flared horn

    H1-H4 form the throat stage; H5-H8 form the bell, in bottom, rear, top, front order. Join the 3 mm side laps beneath adjacent faces, then join H1 to H5, H2 to H6, H3 to H7, H4 to H8 using the intermediate rim laps. Keep the mouth open. Throat is 14 mm square, middle is 30 mm square 22 mm forward, mouth is 76 mm square another 42 mm forward. Each face remains flat. Match the rims rather than forcing every hinge to 90 degrees. Leave throat laps free until mounting.

  6. Seat the horn on the elbow

    Fold the four small throat laps back onto the outside of the elbow outlet walls and glue over a 3 mm depth. Throat corners exactly meet x=-12, y=21/35, z=84/98. Horn axis is horizontal toward cabinet right; mouth plane is x=52 and center is y=28,z=91. Support the bell by hand while the seam dries. The supplied column and elbow carry the horn; no invisible wire or floating support is intended. Do not lift the model by its horn.

  7. Attach the fixed crank shaft

    Assemble A1-A6 into an 18 x 6 x 6 mm closed beam; fold its 1.5 mm laps inward 90 degrees. Glue the entire A5 end face onto cabinet right wall C3 at y=-3 to 3, z=17 to 23. Its center is 50 mm back from the cabinet front and 20 mm above the base. Dry horizontally.

  8. Add the crank drop

    Build B1-B6 as a 6 x 6 x 12 mm box using 1.5 mm inward laps. Glue its complete B6 top onto the outermost 6 x 6 mm area under A1, x=62 to 68, y=-3 to 3, z=17. The lower end stops 5 mm above the tabletop. Let dry without twisting.

  9. Fit the static crank grip

    Build G1-G6 as a 12 x 6 x 6 mm box with 1.5 mm inward laps. Glue the full G5 end onto the bottom 6 x 6 mm of B3 at x=68, y=-3 to 3, z=5 to 11. The grip ends at x=80. All crank joints are glued permanently; do not turn them. Allow the complete display to dry on a flat surface before handling.

Notes

The 3D model shows each piece in its finished, idealized shape; the exploded view only spreads the pieces apart. It is not a paper-physics simulation: curved shapes are forming guides, not exact physical folding or proof of developability, and intermediate fold shapes are not supplied.