Engineering Intern - Materials & Resin Development

Location: Huntington Beach, CA Duration: 3 Month Internship Compensation: $22-$23/hr About the Role SprintRay’s Biomaterial Innovation Lab is seeking an Engineering Intern to support the development of next-generation dental 3D printing resins for DLP and LCD printing platforms. In this hands‑on, on‑site lab role, you will contribute to resin formulation, print process evaluation, post‑processing studies, and material characterization. You’ll work closely with a cross‑functional team to generate data, troubleshoot performance issues, and accelerate iteration on new resin systems. Key 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. Required Qualifications 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 Qualifications 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. What You’ll Gain Hands‑on experience developing and validating dental 3D printing resin materials for DLP/LCD platforms. Mentorship from a multidisciplinary team across materials, process, and device development. Opportunity to contribute to new products and workflows in a fast‑moving digital dentistry environment. Equal Opportunity Employer SprintRay is proud to be an equal opportunity employer. We celebrate diversity and are committed to creating an inclusive environment for all employees. We do not discriminate on the basis of race, color, religion, sex, sexual orientation, gender identity, national origin, veteran, or disability status. Accessibility If you need a reasonable accommodation during the application or interview process, please contact us at View email address on click.appcast.io. #J-18808-Ljbffr SprintRay Inc.