Flexible Resin 3D Printing

Updated: 2026-07-22

Overview

Resin soft gel printing refers to a 3D printing process that utilizes specially formulated flexible resins to create objects with rubber-like properties. Unlike standard rigid resins, these materials cure into elastic solids with varying degrees of softness, typically measured on the Shore hardness scale. This technology has gained prominence in recent years due to its ability to produce functional parts that require both precision and flexibility. The printing process typically uses SLA (stereolithography) or DLP (digital light processing) systems, with the resin curing layer by layer under UV light.

Physical and Chemical Properties

Soft gel printing resins exhibit unique viscoelastic properties that differentiate them from traditional 3D printing materials. They typically have elongation at break values ranging from 150% to 300%, allowing significant deformation without permanent damage. Chemically, these resins are usually polyurethane or silicone-based formulations. They maintain stability across a temperature range of -20°C to 80°C, though specific formulations may vary. The uncured resin has a viscosity of approximately 300-500 cP at 25°C, which affects print speed and layer adhesion.

Main Applications

The medical industry represents a significant application area, where soft gel printing produces custom prosthetics, anatomical models for surgical planning, and flexible medical device components. The material's ability to simulate human tissue makes it particularly valuable for these uses. Consumer product applications include flexible phone cases, ergonomic grips, and wearable device components. Industrial applications feature in gaskets, seals, and vibration-dampening parts where traditional manufacturing methods prove costly for small batches.

Safety and Storage

Uncured resin requires careful handling as it may cause skin irritation or allergic reactions. Always work in well-ventilated areas or with appropriate respiratory protection when handling large quantities. Storage conditions significantly impact resin shelf life. Ideal storage temperatures range between 15-25°C, with protection from direct sunlight. Most manufacturers recommend using opened containers within 6 months and unopened containers within 12 months for optimal performance.

B2B Procurement Guide

When sourcing soft gel printing resins, consider the specific Shore hardness required for your application, which typically ranges from Shore A 10 (very soft) to Shore A 90 (firm). Verify the resin's compatibility with your printing equipment, as curing parameters vary between formulations. For bulk procurement, request material certifications and test reports, particularly for medical or food-contact applications. Evaluate suppliers based on technical support availability, batch consistency, and lead times. Many industrial users establish long-term agreements with resin formulators to ensure consistent quality.