Screw-lid enclosure for the 38-pin ESP32 on its screw-terminal breakout — PhotoPrinted and test-fit

Enclosure 02

38-Pin ESP32 Breakout Enclosure (v2)

A screw-lid box for the 38-pin ESP32 on its 2×19 screw-terminal breakout. You only cut the openings you need.

Printed and test-fit

See the photos Download

Description

This enclosure is built around one specific pairing: the narrow 38-pin USB-C ESP32-WROOM-32 (WROOM-32D) dev board seated on its 2×19 screw-terminal breakout board (78 × 63 mm). The walls print solid, with thin-skin knockouts you cut out from inside only where you need a wire or a cable gland. The rest stays closed.

I printed and test-fit it on my Bambu Lab A1 before posting it. The board and breakout sit on the built-in standoffs. The USB-C opening lines up with the port, so you can program and power the board with the lid on. PG7 glands fit a long-wall knockout and the far-end knockout, and both locknuts clear the board. The long-wall fit is tight, so check that your gland's inside thread plus locknut is under about 6 mm.

It prints as two parts (base and lid) with no supports. The OpenSCAD source is included if you want to change things.

Features

Thin-skin knockouts that look like solid wall until you cut one out:
- Each long wall has one PG7 (12.5 mm) round between two 10 × 6 mm slots.
- The far end has one PG7 between two 5 mm rounds.
A 13 × 8 mm USB-C opening lined up with the board's port.
Four break-off mounting tabs for #6–#8 screws (4.3 mm holes), with score grooves so you can snap off the ones you don't need.
Two sealed floor keyhole slots for #6–#8 pan-head screws.
A 4 mm screw-down lid with counterbored corner holes and a locating lip.
Parametric OpenSCAD source with Customizer options for mounting and wire exits (zip-tie tunnels, magnet pockets and a cable clamp are off by default). It needs OpenSCAD 2021.01 or newer.

Tip: an X-Acto #104 concave carving blade opens the knockouts cleanly.

Parts used

The board and breakout I designed around: 38-pin ESP32 Type-C dev board (narrow) + screw-terminal breakout (3 sets) (opens in a new tab)

Dimensions

Body: 93.8 × 79.8 × 34.9 mm with the lid
Width with tabs: 119.8 × 105.8 mm
Walls, floor, lid: Walls 2.4 mm, floor 3.0 mm, lid 4.0 mm

What's included

A 3MF with two separate objects (base and lid), already in print orientation
STL files (base, lid, optional clamp cap)
Parametric OpenSCAD source

Not included

This is a print file only. The board, screws, cable glands and cables in the photos are not included.

Hardware you'll need

4 × M2.5×6 screws (board)
4 × M3×10 screws (lid)
#6–#8 pan-head screws if you're using the tabs or keyholes
PG7 cable gland(s), optional

Print settings

PLA or PETG
0.20 mm layers
2–4 walls (4 recommended for the base)
15–20% infill
Supports off, no brim
About 1 h 58 min and 72 g for base and lid on a Bambu Lab A1 (0.20 mm Standard, 4 walls on the base)
Use the 3MF's orientation as-is. Don't use Auto-orient.