Dimensional fidelity in 3D printed porous fiber analogs via advanced photopolymerization

Overview

This solution addresses the challenge of producing porous fiber analogs that faithfully replicate digital twin designs. Built on micro-Continuous Liquid Interface Production (μCLIP), a continuous vat photopolymerization process, the approach delivers micron-scale resolution and high geometric fidelity for complex microstructures. By upgrading the UV light engine to native 4K resolution and applying a physics-based model that compensates for radical diffusion and curing-induced errors, the technology enables fabrication of nonwoven porous analogs with tight agreement to their digital models. Potential applications include nonwoven material research, filtration media development, tissue engineering scaffolds, and other fields requiring precise replication of porous architectures.

Technical specifications

Key features:

• Continuous vat photopolymerization (μCLIP): Projects patterned UV light through an oxygen-permeable window, eliminating layer-by-layer separation for smooth, high-fidelity microstructures.
• Native 4K UV light engine upgrade: Integrates a 3840 × 2160 pixel projection system optimized to achieve 5 μm pixel resolution over a 1.92 × 1.08 cm printing area, with optional optical stitching to exceed 1.5 × 1.5 cm build areas.
• Physics-based photopolymerization model: Captures radical diffusion and curing nonuniformity to predict and correct dimensional errors during printing.
• CAD-based dimensional compensation: Integrates the photopolymerization model with iterative design-print-measure workflows using micro-CT feedback.
• Demonstrated scalability: Prior work successfully fabricated spinodal lattice structures measuring 55 mm × 10.5 mm × 5 mm with 150 μm fine features using 30 μm pixel resolution and 5 μm layer thickness.
• Quantitative validation: Delivers pore volume distribution deviation of 5% or less compared to the digital model, verified through micro-CT characterization.

Technology readiness level

The μCLIP platform has been developed and validated over the past decade, with demonstrated capability for micron-scale fabrication of complex architected materials. Prior results include successful production of spinodal lattice structures with excellent scalability and geometric fidelity. The proposed work advances the technology through a hardware upgrade to native 4K resolution and the development of a validated photopolymerization model with iterative CAD-based compensation. Validation will include calibration artifacts and porous fiber analogs, with quantitative micro-CT comparison of printed parts against their digital twins. The deliverable is a 1.5 × 1.5 × 0.5 cm nonwoven porous analog demonstrating 5% or less deviation in pore volume distribution.