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Updated: Feb 5, 2026

3D Printing - Evaluating Particle Emissions of a 3D Printing Pen

3D Printing - Evaluating Particle Emissions of a 3D Printing Pen

Published on: October 9, 2020

Acoustophoretic printing.

Daniele Foresti¹, Katharina T Kroll¹, Robert Amissah¹

¹John A. Paulson School of Engineering and Applied Sciences, Wyss Institute for Biologically Inspired Engineering, Harvard University, Cambridge, MA 02138, USA.

Science Advances

|September 6, 2018

Summary

This summary is machine-generated.

A novel acoustophoretic printing method enables precise drop-on-demand patterning for diverse soft materials, overcoming limitations of existing droplet technologies. This technique offers broad material compatibility and control for advanced manufacturing applications.

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Area of Science:

Materials Science
Engineering
Physics

Background:

Droplet-based printing is crucial for microarrays and additive manufacturing.
Existing methods like inkjet and electrohydrodynamic printing have viscosity and material property limitations.
In-air acoustophoretic forces are material-independent but generally too weak for printing.

Purpose of the Study:

To introduce a new acoustophoretic printing method.
To enable drop-on-demand patterning of a wide range of soft materials.
To overcome the limitations of current droplet-based printing technologies.

Main Methods:

Utilized a subwavelength Fabry-Perot resonator to generate localized acoustophoretic forces.
Developed a material-independent printing technique.
Demonstrated droplet ejection exceeding gravitational force by two orders of magnitude.

Main Results:

Successfully patterned Newtonian fluids (0.5–25,000 mPa·s) and yield stress fluids (>50 Pa).
Achieved accurate, highly localized acoustophoretic force for droplet ejection.
Demonstrated versatility by printing food, optical resins, liquid metals, and cell-laden matrices.

Conclusions:

The developed acoustophoretic printing method is versatile and compatible with a broad spectrum of soft materials.
This technique offers a powerful new tool for drop-on-demand patterning in various scientific and industrial fields.
The method overcomes previous limitations, enabling precise printing of materials previously unsuitable for droplet-based approaches.