Times Table Spinner - clicky multiplication dial

# Times Table Spinner - clicky multiplication dial

Turn the outer ring to the first number, the middle ring to the second number, and the answer pops up in the window next to the right row. Every number clicks into place like a safe dial. Three printed parts, two colors, no supports, no glue, no hardware.

## How it works

- Blue outer ring (A): the first number, 1-10.

- Yellow middle ring (B): the second number, 1-10.

- White cover: one fan-shaped window with the rows x1 to x10 printed along its edge.

- Set A to 7 and B to 8: in the row next to "x8" a blue window opens and shows 56. The other rows stay yellow, so the answer stands out.

- All 100 combinations from 1x1 to 10x10 were checked in CAD.

## Ways to play and learn

1. Quiz: one person sets the rings, the other says the answer before looking.

2. Speed round: call out a problem, see who sets the spinner first.

3. Swap test: 7x8 and 8x7 give the same answer. Kids discover that order does not matter.

4. Fidget mode: the clicks make it fun to turn, so it gets picked up instead of left on a shelf.

## Print settings

- Material: PLA. Nozzle 0.4 mm, layer height 0.2 mm (0.16 mm gives sharper small digits).

- 3 walls, 15 % infill. No supports. No brim needed.

- Multicolor: every part has the body and the digits as separate objects. Assign colors in the slicer: Disc A blue body + white digits, Disc B yellow body + black digits, Cover white body + black labels.

- Can't see the digits in the slicer? On Disc B and the Cover the digits are flush with the surface (best quality on the bed side), so they only show up once they have their own color. Select the digits object of each part and assign it a different filament (Disc B digits black, Cover labels black). On Disc A the white digits are raised 0.1 mm.

- When the slicer asks whether to load as one model with several parts, answer YES. Otherwise the digits drop to the bed.

- All three parts fit on one 250 x 250 mm plate (file: all parts, one plate). Single-part files are included for smaller printers. Diameters: 126, 114 and 102 mm.

- Orientation is already set: Disc A digits up, Disc B and Cover face down on the bed (best surface for the labels).

## Assembly

1. Put the Cover face down on the table, the center pin pointing up.

2. The pin has two thin vertical ridges. Line them up with two of the grooves in the hole of Disc B and slide Disc B down, yellow side facing the cover.

3. Do the same with Disc A, blue digits facing up away from the cover.

4. Press Disc A down until the split pin snaps over the edge in its recess.

5. Flip it over and turn each ring: you should feel 10 clicks per turn.

## Disassembly

Squeeze the two halves of the split pin together from the back of Disc A (fingers, tweezers or flat pliers) and push the pin out. The rings slide off.

## Fit and tolerances

- 0.3 mm radial clearance on the rotating bore, 0.2 mm between the stacked rings, 0.5 mm axial play on the snap so the rings never clamp.

- The click ridges have 0.15 mm interference on purpose.

- Too tight? Run a round file or sandpaper through the ring holes once. Rings sticking to each other? Check for elephant foot on the first layer.

## Files

- Print files: one-plate 3MF, plus each part as 3MF and as separate body/digits STL.

- Click tests: small test pieces of the center to check the clicks and the snap on your printer in about 15 minutes before printing the full set.

Designed in Autodesk Fusion. Tested on an Anycubic Kobra X.

## Suggested tags

multiplication, times table, math, education, learning toy, fidget, spinner, kids, school, multicolor, no supports, snap fit