A Decade of Melt Electrowriting.

Area of Science:

• Additive Manufacturing
• Materials Science
• Biomedical Engineering

Background:

• Melt electrowriting (MEW) is an additive manufacturing technology that has seen significant development over the last decade.
• Despite advancements, the software and hardware ecosystems for MEW are still maturing, and mastering its multi-parametric nature presents challenges.
• Previous research has focused on parametric development across various systems and polymers, primarily poly(ε-caprolactone), identifying trends in processing requirements.

Purpose of the Study:

• To provide a unique perspective on the dynamic relationships between melt electrowriting processing parameters.
• To elucidate how these parameters interact to achieve ideal printing conditions for scaffold fabrication.
• To guide researchers in mastering the complex parameter space of MEW for high-quality fiber deposition.

Main Methods:

• Review of existing literature and research on melt electrowriting processing parameters.
• Categorization of parameters into those affecting polymer flow (to/from nozzle) and environmental conditions.
• Analysis of the influence of key parameters such as applied voltage, pressure, collector speed, polymer temperature, nozzle diameter, and charge buildup conditions (e.g., relative humidity).

Main Results:

• Identified key influential parameters for high-quality MEW printing: applied voltage, applied pressure, collector speed, polymer temperature, nozzle diameter, and conditions promoting charge buildup.
• Highlighted other affecting factors including ambient temperature, nozzle characteristics, collector properties (temperature, conductivity), and collector distance.
• Defined printing success as fibers accurately following programmed paths with predictable diameters.

Conclusions:

• The dynamic interplay between MEW processing parameters is crucial for successful scaffold fabrication.
• Optimizing parameters such as voltage, pressure, temperature, and environmental conditions leads to precise fiber placement and diameter control.
• Further understanding and control of these parameter relationships are essential for advancing MEW technology in producing high-quality scaffolds.