---
title: "Raspberry Pi Pico case, 3D printed: 51 x 21 mm, holes at 47 x 11.4 mm, BOOTSEL access"
description: "The Pico, Pico W, Pico 2 and Pico 2 W share one footprint. Dimensions, hole pattern, how to keep BOOTSEL reachable, and a prompt for a case under 10 mm tall."
canonical: https://speakcad.com/blog/raspberry-pi-pico-case-3d-print
published: 2026-09-08
updated: 2026-09-08
publisher: SpeakCAD
---

# Raspberry Pi Pico case, 3D printed: 51 x 21 mm, holes at 47 x 11.4 mm, BOOTSEL access

> The Pico, Pico W, Pico 2 and Pico 2 W share one footprint. Dimensions, hole pattern, how to keep BOOTSEL reachable, and a prompt for a case under 10 mm tall.

## One footprint for the whole family

| Measurement | Value |
|---|---|
| Board outline | 51 x 21 mm |
| Thickness | 1 mm (thinner than most boards) |
| Mounting holes | 4 x 2.1 mm on a 47 x 11.4 mm pattern |
| USB | Micro-B on the short edge, centred, overhangs by 1.3 mm |
| BOOTSEL button | On top, about 12 mm from the USB edge, centred |
| Debug header | 3 pins on the short edge opposite the USB (Pico), a 3-pin JST-SH on the Pico 2 and W variants |
| Antenna (W models) | Far short edge, keep 3 mm clear |
| Castellated edges | Pin pitch 2.54 mm, 40 pins |

The Pico 2 and Pico 2 W keep the outline and holes, so one case serves all four boards. The only difference to mention is the antenna keep-out on the W models.

## BOOTSEL matters

To flash a Pico you hold BOOTSEL while plugging in the USB. A case that hides the button forces you to open it every time. Two options:

1. A 5 mm hole in the lid above the button; press with a pen.
2. A printed plunger: a 4.5 mm pin captured in the lid that sits on the button. Ask for "a captive button plunger above BOOTSEL".

## The prompt

> **Prompt** A slim two-part case for a Raspberry Pi Pico W, board 51 x 21 x 1 mm, four 2.1 mm holes on a 47 x 11.4 mm pattern. Two 2 mm locating pegs, 1.5 mm walls, 0.3 mm clearance, 6 mm internal height. A 9 x 4 mm micro USB cutout centred on the short edge 1 mm above the floor, a 5 mm hole in the lid above BOOTSEL 12 mm from the USB edge, 3 mm antenna keep-out at the far edge, friction-fit lid. Total height under 10 mm.

## Headers and the pins

If headers are soldered and pointing down, the case base needs two 2.54 mm-pitch channels 17.8 mm apart, or the board sits on the pins with 9 mm of clearance under it. If you want the pins reachable, ask for the long sides to be open above the board edge. Many Pico projects use a breakout board instead; give the breakout's outline and treat the Pico as the tallest component.

## Common variants

- A keyring case with a 5 mm loop for a USB HID gadget
- A case with a 16 x 8 mm slot for a JST battery connector on a Pico-based data logger
- A panel-mount version with a flange and two 3 mm screw holes
- A dual-Pico case for a project with a display Pico and a sensor Pico

## Library parts

[Slim case for a Raspberry Pi Pico](/library/raspberry-pi-pico-slim-case) and [Pico W enclosure with header slots](/library/raspberry-pi-pico-w-enclosure-header-slots) open pre-filled in the builder.

## Prompts to try

- A slim two-part case for a Raspberry Pi Pico W, board 51 x 21 x 1 mm, four 2.1 mm holes on a 47 x 11.4 mm pattern. Two 2 mm locating pegs, 1.5 mm walls, 0.3 mm clearance, 6 mm internal height. A 9 x 4 mm micro USB cutout centred on the short edge 1 mm above the floor, a 5 mm hole in the lid above BOOTSEL 12 mm from the USB edge, 3 mm antenna keep-out at the far edge, friction-fit lid. Total height under 10 mm. ([open in SpeakCAD](https://app.speakcad.com/signup?next=%2F%3Fprompt%3DA%2520slim%2520two-part%2520case%2520for%2520a%2520Raspberry%2520Pi%2520Pico%2520W%252C%2520board%252051%2520x%252021%2520x%25201%2520mm%252C%2520four%25202.1%2520mm%2520holes%2520on%2520a%252047%2520x%252011.4%2520mm%2520pattern.%2520Two%25202%2520mm%2520locating%2520pegs%252C%25201.5%2520mm%2520walls%252C%25200.3%2520mm%2520clearance%252C%25206%2520mm%2520internal%2520height.%2520A%25209%2520x%25204%2520mm%2520micro%2520USB%2520cutout%2520centred%2520on%2520the%2520short%2520edge%25201%2520mm%2520above%2520the%2520floor%252C%2520a%25205%2520mm%2520hole%2520in%2520the%2520lid%2520above%2520BOOTSEL%252012%2520mm%2520from%2520the%2520USB%2520edge%252C%25203%2520mm%2520antenna%2520keep-out%2520at%2520the%2520far%2520edge%252C%2520friction-fit%2520lid.%2520Total%2520height%2520under%252010%2520mm.))
- A Pico case for a board with headers soldered pointing down: 51 x 21 mm outline, two 2.54 mm pitch channels in the base 17.8 mm apart, 1.6 mm walls, 10 mm internal height, micro USB cutout, a captive 4.5 mm button plunger in the lid above BOOTSEL, snap-fit lid. ([open in SpeakCAD](https://app.speakcad.com/signup?next=%2F%3Fprompt%3DA%2520Pico%2520case%2520for%2520a%2520board%2520with%2520headers%2520soldered%2520pointing%2520down%253A%252051%2520x%252021%2520mm%2520outline%252C%2520two%25202.54%2520mm%2520pitch%2520channels%2520in%2520the%2520base%252017.8%2520mm%2520apart%252C%25201.6%2520mm%2520walls%252C%252010%2520mm%2520internal%2520height%252C%2520micro%2520USB%2520cutout%252C%2520a%2520captive%25204.5%2520mm%2520button%2520plunger%2520in%2520the%2520lid%2520above%2520BOOTSEL%252C%2520snap-fit%2520lid.))
- A panel-mount enclosure for a Raspberry Pi Pico 2: 51 x 21 mm board on 2 mm pegs at 47 x 11.4 mm, 8 mm internal height, a 3 mm wide flange around the base with two 3.2 mm screw holes 60 mm apart, micro USB cutout and a 5 mm BOOTSEL hole. ([open in SpeakCAD](https://app.speakcad.com/signup?next=%2F%3Fprompt%3DA%2520panel-mount%2520enclosure%2520for%2520a%2520Raspberry%2520Pi%2520Pico%25202%253A%252051%2520x%252021%2520mm%2520board%2520on%25202%2520mm%2520pegs%2520at%252047%2520x%252011.4%2520mm%252C%25208%2520mm%2520internal%2520height%252C%2520a%25203%2520mm%2520wide%2520flange%2520around%2520the%2520base%2520with%2520two%25203.2%2520mm%2520screw%2520holes%252060%2520mm%2520apart%252C%2520micro%2520USB%2520cutout%2520and%2520a%25205%2520mm%2520BOOTSEL%2520hole.))

## FAQ

### Does the Pico 2 fit a Pico case?

Yes. The Pico, Pico W, Pico 2 and Pico 2 W share the 51 x 21 mm outline, the 47 x 11.4 mm hole pattern and the USB position. Mention the W models so an antenna keep-out is added.

### How do I reach BOOTSEL in a case?

Ask for a 5 mm hole in the lid above the button, about 12 mm from the USB edge, or for a captive plunger so you can press it with a finger.

### Why 2 mm pegs and not screws?

The Pico's holes are 2.1 mm, too small for M2.5. Pegs locate the board and the lid keeps it down, giving a case under 10 mm tall. For screws, ask for M2 standoffs.

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