Step Test for Rapid Screening of Material and Process Parameters for Resin Development in DLP 3D Printing

Area of Science:

• Materials Science
• Chemical Engineering
• Additive Manufacturing

Background:

• Vat polymerization 3D printing success relies on optimized resins and printing parameters.
• Current methods for resin and parameter optimization are time-consuming and labor-intensive.
• Digital Light Processing (DLP) is a key vat polymerization technique.

Purpose of the Study:

• To develop a rapid parameter screening method for 3D printing resins.
• To enable efficient evaluation of multiple printing parameters simultaneously.
• To accelerate the identification of optimal printing conditions for new resins.

Main Methods:

• A novel 'step test' was developed for rapid parameter screening.
• The test evaluates 24 printing parameter settings within a single 3D print.
• Optical characterization was used, eliminating the need for specialized analytical devices.
• Key parameters screened include exposure energy, exposure time, and layer thickness.

Main Results:

• The step test successfully defined optimal printing parameters for three commercial resins.
• The polymerization efficiency of two biobased, noncommercial resins was evaluated.
• The test demonstrated applicability to resins with phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide and curcumin photoinitiators.

Conclusions:

• The developed step test is a straightforward, rapid, and accessible method for 3D printing resin optimization.
• This approach significantly reduces experimental iterations and time required for parameter screening.
• The method is adaptable to other UV polymerization-based printing techniques, speeding up product development.