# Adafruit MacroPad RP2040 key plate

The key plate of the Adafruit MacroPad RP2040 kit (Adafruit product 5128,
https://www.adafruit.com/product/5128): a plate with rounded corners and a 3 × 4 grid of square key switch cut-outs.
Not affiliated with or endorsed by Adafruit.

## Geometry

On the XY plane from z = 0, centred on the origin, the long side along Y.

| Feature | mm |
|---|---|
| Plate | 59.69 × 78.74 (2.35 × 3.1 in) |
| Thickness | 1.57 (the model's; parameter) |
| Corner radius | 2.54 |
| Switch cut-outs | 3 × 4, 14.224 square (0.56 in) |
| Cut-out pitch | 19.05 (0.75 in) both ways, grid centred |

## Parameters

| Parameter | Meaning |
|---|---|
| `thickness` | plate thickness, mm |

No material is assigned (the model names none).

## Sources

Adafruit publishes a 3D model of the plate but no dimensioned drawing. **The geometry was measured from the published
reference model** below (its largest face gives the plate's plane, its extent across it the thickness; the outline
of its mid-thickness section was read edge by edge), and the preset is checked against it: bounding box within
0.05 mm and volume within 2 %.

- **Adafruit_CAD_Parts**, `5128 MacroPad RP2040 Kit/5128 MacroPad RP2040-Keyplate.step` (commit 5ead410a, added by
  Noe Ruiz), https://github.com/adafruit/Adafruit_CAD_Parts, © 2016 Adafruit Industries, **MIT** licence
  (the repository's LICENSE). Distributed by step.parts as `adafruit_5128_macropad_rp2040_keyplate`.

Simplifications: three of the model's cut-outs have one corner rounded to 0.254 mm (a modelling artefact; 0.07 mm³ in
all): all cut-outs are drawn square.

Preset list: from the step.parts catalogue (MIT), see `library/NOTICE.md`.