ESP32 DevKitC enclosure, customizable: snap-on lid and USB opening

A two-part case for the ESP32-DevKitC V4 dev board, 61.3 x 37.9 x 21.1 mm outside with the lid on. The board lies pins down on two ribs between its header rows, 9 mm above the floor, and four small blocks stop it sliding sideways. A 12 x 7.5 mm end wall opening leaves the micro-USB port free. The lid has six vent slots and two snap arms that click into windows in the long walls. Set the space under and above the board and the USB opening size.

Customize Change it with AIFree STL, 3MF and STEP, no accountMeasured on the model

Parameters

Wall thicknessmm

Floor thicknessmm

Space under board (header pins)mm

Space above board (parts, wires)mm

USB opening widthmm

USB opening heightmm

Vent slots in lid

Sliders and downloads are free. Changes by the AI designer use credits like any design; new accounts start with free ones.

Both parts print flat with no supports. The board outline comes from the Espressif drawing; the board thickness and the pin length are assumed, and the snap fit is checked on the model only. Measure how far your header pins stick out under the board and set the space under it. There are no cut-outs for the EN and BOOT buttons, and clone boards (30 or 38 pin, USB-C) differ, so measure yours.

Parameters

Every slider in the viewer above, with the range the model accepts. The model rebuilds valid at both ends of each range.

Parameter	Range	Default	What it changes
Wall thickness	1.6 to 4 mm	2 mm	Thickness of the side and end walls. The snap windows go through the long walls.
Floor thickness	1.2 to 4 mm	2 mm	Thickness of the base floor.
Space under board (header pins)	3 to 14 mm	9 mm	Space between the floor and the underside of the board, for the header pins. Set it to how far your pins stick out below the board; lower it for short pins or no headers.
Space above board (parts, wires)	4 to 14 mm	6.5 mm	Space between the top of the board and the lid. Raise it if you plug in tall parts or wires on top.
USB opening width	9 to 20 mm	12 mm	Width of the opening for the USB plug in the end wall. Raise it for a bulky plug.
USB opening height	5 to 12 mm	7.5 mm	Height of the opening for the USB plug, measured up from just below the top of the board. At the defaults it runs up to the rim and the lid closes it.
Vent slots in lid	On or off	On	Cuts six vent slots in the lid over the board. Turn it off for a closed lid.

Proof: measured on the model

What the design must satisfy and what our CAD engine measured on the model at the default values. Only measured values are shown here; nothing on this page has been printed by us yet.

Requirement	Wanted	Measured
Inside length, for the 48.26 mm board and its 6.04 mm antenna overhang	57.3 mm (1.5 mm gap at each end)	57.3 mm
Inside width, for the 27.94 mm board and the snap arms beside it	33.94 mm (3 mm per side)	33.94 mm
Space between the floor and the underside of the board, for the header pins	9 mm (the slider)	9 mm
Width of the USB opening in the end wall	12 mm (the slider)	12 mm
Bottom of the USB opening above the bed (top of the board at 12.6 mm)	12.1 mm (0.5 mm below the top of the board)	12.1 mm
Gap between the closed lid's snap arms and the board	1 mm or more	1.5 mm

base: valid solid, one body, 61.3 x 37.9 x 19.1 mm, fits a 256 x 256 x 256 mm printer; overhangs: 0.9% of surface would need support.
lid: valid solid, one body, 61.3 x 37.9 x 13.1 mm, fits a 256 x 256 x 256 mm printer; overhangs: 0.1% of surface would need support.
Motion: 1 moving joint swept through its range with every pose checked for collisions, no problem reported at the defaults. See the Joints tab in the viewer.

Print notes

Orientation: Both flat: the base stands on its floor as modelled, and the lid prints upside down, plate on the bed and snap arms pointing up (the downloads lay it out that way).
Supports: None
Material: PLA or PETG. The snap strain was checked against a PLA limit.
Layer height: 0.2 mm
Hardware: 1 x ESP32-DevKitC V4 board (not printed)
Time and filament: About 1 h and 22 g at the default size: a rough estimate from the model's volume and surface (PLA, 15% infill, about 1 mm of walls, 0.2 mm layers), not a slicer.

Measure how far your header pins stick out under the board, plastic spacer included, and set the space under the board a little higher than that. The pin length was not modelled.
Try your USB cable in the opening before closing the lid. Its bottom edge is only 0.5 mm below the top of the board, so a plug with a thick moulding may stop short. Use a slim plug, or ask the designer to lower the opening.
Lay the board on the ribs with the USB end at the opening, then press the lid straight down until both arms click. To open it, press the two hooks in through the windows in the long walls.
The snap fit (0.27 mm hooks) is checked on the model only. Print both parts once and try it before relying on it.

How it was designed

Designed with buildcad's AI agent, checked by the buildcad team. This is the request it started from and an edited account of what it did (more on how text to CAD works).

The request
An enclosure for an ESP32-DevKitC V4 dev board with the USB port accessible and a snap-on lid.

1
It read the board drawing
The agent loaded the DevKitC V4 entry of the parts library, from Espressif's dimension drawing: a 48.26 x 27.94 mm board with no mounting holes, the micro-USB centred on one short edge, and the antenna overhanging the other by 6.04 mm. With no holes to screw into, it planned two ribs under the board and blocks beside it.
2
Checks first
Its checks: the board inside the base with no overlap, the closed lid clear of the base, an inside length of 57.3 mm (board, antenna and two 1.5 mm end gaps), an inside width of 33.9 mm with 3 mm beside the board for the snap arms, and a clear path through the USB opening.
3
First build
Base, lid and a board stand-in built at once, and every check passed: 57.3 x 33.94 mm inside, 61.3 x 37.94 x 19.1 mm for the base. The assembly check pushed the lid on over 14 mm with no collision, 1.5 mm from the board, and found a snap strain of 0.61% against a 1.0% limit for PLA on both arms.
4
Every slider extreme
After a section view, the agent ran the slider sweep: all 12 extremes built as valid single bodies, and the assembly was checked again at each one with no collision. Under 1% of the base's surface counted as overhang.
5
What it left to the maker
Its reply says the case was not test-printed, that it assumed the header pins point down (9 mm of room under the board), that clone boards differ, and that there are no cut-outs for the EN and BOOT buttons.

One run of the agent: 2 min 10 s, about $0.29 of model time at list price (claude-sonnet-5-5). The model code behind this page is the code it wrote, unchanged.

Change it with AI

Set the sliders, then press Change it with AI: a copy goes to your designs at those sizes and the designer opens with a suggested change you can edit. Its changes use credits like any design; new accounts start with free ones.

Change it with AI Describe your own part Use it from your own AI (MCP)