Otoplastics 3Dresyn OTO-S MF Bio – Monomer-Free Bio-Based Soft Resin (Shore A50)

Soft and highly flexible photopolymer for otoplastics and hearing-related components (bio-based MF system)

Product description

3Dresyn OTO-S MF Bio is an advanced photopolymer engineered for the fabrication of soft, flexible ear molds and otoplastic components.

The material provides high flexibility and elasticity without cracking under normal deformation, enabling comfortable and durable performance in wearable audiology applications.

The formulation is based on a bio-based (>60% bio content) and Monomer-Free (MF) system, supporting controlled biocompatible workflows and safer material handling.

It is compatible with a wide range of SLA, DLP and LCD systems used in professional audiology and dental laboratories.

Application framework

Intended for professional use in vat photopolymerization (SLA, DLP and LCD) additive manufacturing for audiology and otoplastics workflows.

Final suitability of printed parts must be validated by the user according to the specific application, processing conditions and applicable regulatory requirements.

Typical applications

• Soft ear molds and earmolds
• Flexible ear tips and inserts
• Comfort-fit wearable otoplastic components
• Flexible sealing components for hearing devices

Material properties & test methods

Mechanical properties

• Tensile strength: ~2–5 MPa (ISO 527-1 / ISO 527-2)
• Young’s modulus: ~1–3 MPa (ISO 527-1 / ISO 527-2)
• Elongation at break: ~120–200% (ISO 527-1 / ISO 527-2)
• Shore hardness: A50 (ISO 868)

Thermal behaviour

• Stable performance under typical wearable conditions

Physical properties

• Shrinkage: very low (typical)
• Resolution capability: very high (features below 20 µm depending on process)
• Dimensional stability: high

Functional performance characteristics

• High flexibility and elasticity for improved comfort
• Resistant to cracking under normal deformation
• Soft-touch material behavior for wearable applications
• Good dimensional stability despite low modulus
• Suitable for complex and thin geometries

Printing & processing guidelines

• Printing technologies: SLA, DLP and LCD
• Wavelength range: 385–405 nm
• Compatible with most commercial and professional systems when properly calibrated
• Optimized for high-resolution flexible structures
• Follow 3Dresyns IFU for exposure, washing and post-curing

Workflow recommendations

• Ensure complete post-curing to achieve final mechanical and safety performance
• Validate cleaning and post-processing workflows for each application

Biocompatibility & quality framework

• Bio-based formulation (>60% bio content)
• Monomer-Free (MF) formulation as supplied
• Biocompatibility-related testing may be performed under controlled laboratory conditions
• Evaluation frameworks may include ISO 10993 methodologies
• Manufacturing aligned with ISO 13485 quality management systems
• Final biological performance depends on validated processing workflow

Important note

Although supplied as a monomer-free formulation, final part safety and biocompatibility depend on complete polymerization and proper post-processing. Printed otoplastic components must undergo validated cleaning and post-curing workflows to minimize potential extractables, leachables and residual species. Final device qualification remains the responsibility of the legal manufacturer.

Testing & processing disclaimer

Material properties are measured on printed and post-processed specimens and may vary depending on printer type, printing parameters, build orientation, post-curing conditions and workflow validation. Reported values are indicative and provided for reference only.

Regulatory & legal notice

This material is supplied as a professional manufacturing material for audiology and otoplastics workflows and is not marketed as a finished medical device. The regulatory classification, conformity assessment and validation of any final device manufactured using this material remain the sole responsibility of the legal manufacturer in accordance with applicable regulations.

Why choose 3Dresyn® OTO-S MF Bio

• High flexibility and comfort for wearable applications
• Bio-based and monomer-free formulation
• Excellent elongation and deformation resistance
• Very high resolution and low shrinkage
• Compatible with SLA/DLP/LCD systems

Document reference: TDS-OTO-S-MF-BIO-EN | Version: 1.0 | Last updated: March 2026