PLA 3D Printing as a Straightforward and Versatile Fabrication Method for PDMS Molds

Area of Science:

• Materials Science
• Biotechnology
• Additive Manufacturing

Background:

• 3D printing enables rapid prototyping of polydimethylsiloxane (PDMS) molds.
• Resin printing is common but expensive and requires specialized equipment.
• A need exists for more accessible and affordable PDMS mold fabrication methods.

Purpose of the Study:

• To evaluate polylactic acid (PLA) filament printing as a cost-effective alternative for PDMS mold fabrication.
• To develop and demonstrate a method for smoothing 3D printed PLA molds.
• To validate the use of PLA-printed molds for creating functional PDMS-based microstructures for cell culture.

Main Methods:

• Designing and 3D printing a PLA mold for PDMS wells.
• Applying a chloroform vapor treatment to smooth the surface of the PLA mold.
• Casting PDMS prepolymer in the smoothed mold and fabricating PDMS-glass wells.
• Assessing PDMS-glass well integrity and suitability for cell culture using confocal microscopy and ELISA.

Main Results:

• PLA filament printing proved to be a cheaper and more accessible method compared to resin printing.
• Chloroform vapor treatment effectively smoothed the 3D printed PLA mold surface.
• The fabricated PDMS-glass wells demonstrated no leakage and were suitable for their intended application.
• Cell culture experiments using monocyte-derived dendritic cells (moDCs) showed no adverse effects on cell morphology or cytokine production.

Conclusions:

• PLA filament 3D printing is a viable, economical alternative for producing PDMS molds.
• Post-processing with chloroform vapor enhances the surface quality of PLA molds.
• This method provides a versatile tool for researchers needing custom PDMS microstructures for applications like cell culturing.