Modular Breadboard Spacers for Cleaner, More Scalable Prototyping

If you’ve ever worked on a complex electronics prototype, you know how quickly a breadboard can turn into a chaotic forest of jumper wires. When using mini breadboards—especially multiple ones side by side—space is limited and the layout becomes hard to manage.

To solve this, I designed custom 3D-printed spacers that let you cleanly separate mini breadboards or controller boards such as Arduino, ESP32, Raspberry Pi Pico, and others. These spacers create a modular, ergonomic workspace that promotes a block-based prototyping approach, giving every part of your project the room it deserves.

Whether you’re building a sensor array, an embedded system, or a neat classroom demo, these spacers make your setup clearer, more organized, and easier to troubleshoot.

3D printer (FDM recommended)

PLA, PETG, or ABS filament

Mini breadboards or other breadboards (need to redesign the STL file)

Optional: Arduino or microcontroller boards

My STL files (upload them to Instructables or link to Thingiverse/Printables)

Mini breadboards are great for small experiments, but when your circuit grows, stacking them side-by-side feels cramped. Jumpers get tangled, modules crowd each other, and debugging becomes tedious.

These spacers fix that by:

1. Creating consistent spacing between boards
2. Offering mounting freedom, so each section of your project is clearly defined
3. Encouraging a modular mindset, where each functional block is visually separated

Result: A cleaner prototype, easier documentation, and faster debugging.

The included STL files are parameterized for standard mini breadboards. Print them flat, no supports needed.

Recommended Print Settings:

1. Layer height: 0.2 mm
2. Infill: 20%
3. Material: PLA (easy), PETG (stronger)
4. Build time: ~20 mins

Once printed, you can add a peel off the adhesive backing of your spacer

rrange your breadboards with spacers between them until you obtain the layout that fits your project.

Here are a few ideas:

1. Add spacers around your Arduino Uno or ESP32 board to give sensor modules room
2. Create a signal-processing block, power block, and output block separated by spacers
3. Build a teaching setup where each section of a circuit is physically isolated for clarity

The result is a clean, professional-looking prototyping platform.

The spacer dimensions can be easily adapted if you want:

1. Wider gaps
2. Custom lengths
3. Mounting holes
4. A slotted cable guide
5. A logo or label embossing

If you share your remixes, tag the project so others can benefit!