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SprintRay Inc. · 19 hours ago

Engineering Intern – Materials & Resin Development

Huntington Beach, CA

Internship

Onsite

Intern

$28/hr - $32/hr

SprintRay Inc. is a company focused on advancing dental technology through innovative 3D printing solutions. They are seeking an Engineering Intern to assist in the development of dental 3D printing resins, contributing to formulation, process evaluation, and material characterization in a hands-on lab environment.

3D PrintingDentalHealth CareMedical Device

Growth Opportunities

H1B Sponsor Likely

Responsibilities

Assist in photopolymer resin formulation (mixing, batching, additive screening, pigmentation, and process controls)

Support experimental planning and design-of-experiments (DOE) to evaluate formulation and process variables

Run DLP and LCD 3D printing trials to assess printability, cure response, feature fidelity, accuracy, and surface quality

Evaluate process windows (exposure settings, layer thickness, build orientation, supports) and document outcomes

Support post-processing optimization (cleaning/washing, UV curing, thermal treatments as applicable) and quantify impacts on properties

Perform materials testing and characterization on resins and printed samples, such as:

Viscosity / rheology measurements

Cure behavior / degree of cure (as applicable)

Mechanical testing (tensile/flexural/compression, hardness)

Dimensional accuracy, shrinkage, and stability

Visual/optical properties (color, translucency) as applicable

Analyze and summarize data; maintain clear lab documentation (notebooks, protocols, reports, and traceable datasets)

Collaborate with engineers/scientists to troubleshoot issues and propose improvements

Follow all lab safety procedures and quality practices applicable to medical device development

Qualification

Materials ScienceResin Formulation3D PrintingData AnalysisMechanical TestingLab Safety ProceduresCommunication SkillsTeam Collaboration

Required

Minimum Bachelor's degree (completed or in progress) in Biomedical, Chemical, Mechanical Engineering, Materials Science, Chemistry, or a closely related field

Ability to work on-site in Huntington Beach, CA for the full internship term (3–6 months)

Hands-on lab experience (academic or industry) in materials, polymers, chemistry, formulation, or testing

Comfort working with data and documentation (Excel/Google Sheets; basic plotting/analysis)

Strong communication skills and ability to work effectively in a team environment

Preferred

Experience with photopolymers, resin chemistry, polymers, or composites

Familiarity with DLP and/or LCD printing workflows and parameter optimization (exposure, layer thickness, supports)

Experience with characterization tools (e.g., viscometer/rheometer, FTIR, DSC/DMA, mechanical test frames)

Interest in digital dentistry, dental materials, or medical device R&D

Exposure to regulated development environments (ISO 13485, GMP) is a plus

Company

SprintRay Inc.

We are a 3D Printer manufacturer focused on digital dentistry.

Founded in 2014

Los Angeles, California, USA

501-1000 employees

http://sprintray.com/

H1B Sponsorship

SprintRay Inc. has a track record of offering H1B sponsorships. Please note that this does not guarantee sponsorship for this specific role. Below presents additional info for your reference. (Data Powered by US Department of Labor)

Distribution of Different Job Fields Receiving Sponsorship

Represents job field similar to this job

Trends of Total Sponsorships

2025 (11)

2024 (3)

2023 (3)

2022 (12)

2021 (6)