# Open-source micro-manipulator reaches version 4.0 with redesigned mechanics

> **Key takeaway:** An open-source 3D-printable micro-manipulator project released version 4.0 with redesigned ball joints, improved mechanical constraints, and g-code tool support.

**Published:** 2026-10-19T18:00:25+00:00 
**Source:** Hackaday Hardware 
**Category:** open-hardware 
**Canonical URL:** https://fosswire.org/news/open-source-micro-manipulator-reaches-version-40-with-redesi.html 

## Summary
The open-source micro-manipulator project has released version 4.0 with substantial mechanical improvements. The device uses stepper motors and parallel kinematics for sub-millimeter positioning of probes or tools. Version 4.0 addresses five specific design flaws including self-collision during homing, loose ball joint constraints, inconsistent linkage rod lengths, excess friction, and glued-in rubber bands. The project also changed its control API and added g-code tool support for applications like laser engraving.

## What changed in version 4.0
- **Self-collision during homing eliminated** — previously the mechanism could crash into itself when seeking its reference position
- **Ball joint block redesigned** — earlier screw-only mounting allowed unwanted rotation; now better constrained
- **Linkage rod length now consistent** — previous design lacked a reliable method to ensure uniform rod lengths
- **Ball joint friction reduced** — unnecessary friction removed from the joint design
- **Ball position accuracy decoupled from print quality** — less sensitive to corner rounding and print variations
- **Rubber band retention changed** — bands can now be replaced without being permanently glued
- **API changed** — control interface updated; g-code tool support added for laser engraving and similar applications

## Why it matters
The project provides a low-cost alternative to commercial micro-manipulators for labs, hobbyists, and small workshops working with IC probing, microscopy, or precision assembly. The g-code support extends its utility to light CNC applications like micro-scale laser engraving.