STM32MP257F-EV1 baseplate with breadboard holder

STM32MP257F-EV1 Baseplate with Breadboard Holder

A simple, lightweight baseplate that holds the STMicroelectronics STM32MP257F-EV1 evaluation board (MB1936) and a full-size breadboard side by side. It turns the board and the breadboard into one tidy, stable unit on your desk.

Layout

• The board is mounted with the Ethernet, USB and power connectors facing the back, so cables stay out of your way.

• The buttons and the BOOT switch face the front, within easy reach.

• The 40-pin GPIO header runs right next to the breadboard (6 mm gap), so jumper wires stay short and straight.

Features

• Open honeycomb design: light, fast to print and keeps the underside of the board free (including the mikroBUS connector).

• Mounts on the board’s own 4 hex standoffs with M3 screws from below. The screw heads are recessed, so the plate sits flat.

• The breadboard is held by 4 L-shaped corners with a snug press fit (0.25 mm clearance). You can push it out from below through the honeycomb.

• Mounting hole positions come from ST’s official mechanical drawing (UM3359, Fig. 6).

• Fits in one piece on a 256 × 256 mm bed (236.6 × 170.6 mm).

What you need

• 4× M3×8 socket head screws (M3×10 if your standoffs have deep enough threads)

• 1× standard 830-point breadboard (165 × 55 × 8.5 mm)

• The STM32MP257F-EV1 with its original standoffs

Print settings

• Material: PLA

• Layer height: 0.2 mm

• Walls: 3

• Infill: 20% (not critical)

• Supports: none

• Orientation: flat, as provided

Customizing
The OpenSCAD source is included and fully parametric. Not every breadboard has exactly the same size. If yours is too tight or too loose, change bb_clr (for example 0.15 or 0.35). You can also change gap, the corner height l_h or the honeycomb size, then export a new STL.

Printed and tested on an Elegoo Centauri Carbon 2.