🏗️ Micro Mechanized Loop

30 Jan 2026 | by Marta

Looking for a tiny, mesmerizing desk toy? This is a Micro Mechanized Marble Loop designed for maximum satisfaction in a minimal footprint! 🌀✨

🛠️ Project Details

Ball Size: 12.7 mm (0.5 inch) marbles.
STL file
Onshape model

The loop is powered by a single SG90 micro servo and an ESP32-S3 board. Instead of a bulky elevator, I used a piece of 1mm wire as the lifting arm to reset the ball's position. It’s simple, lightweight, and very cool to watch! 🤖🦾

⚙️ Technical Specifications

Brain: ESP32-S3 (but easily adaptable to any microcontroller).
Actuator: 1x SG90 Micro Servo.
Mechanism: DIY 1mm wire lifting arm.
Goal: A simple, yet incredibly satisfying continuous loop. 🔁

🔧 Assembly Tip

The lift arm is made from a short piece of 1mm stiff wire (like a paperclip or floral wire). You’ll need to bend it slightly to match the servo's horn and the track height for the perfect "hand-off" of the ball! 🖇️🛠️

Fun Fact: This is a great way to use up those leftover scraps of filament and spare servos you have lying around. It’s small enough to sit right under your monitor! 🖥️🤏