Product Engineer Needed- Diabetic Insole Design Review & Technical Product Drawings

Job Overview I'm looking for an experienced mechanical or product engineer for a three-part engagement covering a new medical-grade diabetic foot relief insole: Part 1 — Engineering feasibility review. I will provide a complete Product Design Specification (shared under NDA). You will deliver a structured written report assessing the design's structural integrity, manufacturability, material suitability, and clinical plausibility across 10 specific areas. Part 2 — 3D CAD model & STL file. You will build a fully parametric 3D CAD model from the specification, then export a print-ready STL file suitable for FDM 3D printing in flexible TPU filament, plus a STEP file for universal compatibility. Part 3 — Formal technical drawings. You will generate a set of nine professional-grade 2D technical figures directly from the CAD model, for use in engineering records and product documentation. About the Product The insole is designed for patients with diabetic peripheral neuropathy — a condition causing loss of protective sensation in the feet and significantly elevated ulcer risk. The design incorporates a recessed metatarsal offloading channel, a deep heel cup, four graduated-hardness material zones, and a hexagonal antimicrobial perforation system. It is intended for 3D-printed production in TPU (thermoplastic polyurethane), with a longer-term injection-molded EVA variant for scale. What You'll Review The spec document includes full dimensional tables, material targets, Shore A hardness zone specifications, manufacturing approach, and stated clinical performance targets. Your report will address: Are the specified graduated Shore A hardness values across four zones structurally sound for a full-length weight-bearing insole, and is there a risk of collapse or excessive deformation in the softer zones? Is the specified metatarsal channel depth structurally compatible with the forefoot base thickness — i.e., is there sufficient base material beneath the channel floor? Is the specified heel cup depth feasible within the total heel height, and is the resulting heel envelope compatible with standard shoe lasts? Can variable infill density in FDM/SLS TPU reliably achieve the four target hardness zones? Is dual-density EVA injection molding a practical production route for this design? Are the specified flexible elastomer material grade and silver-ion antimicrobial textile appropriate for direct skin contact in a diabetic care context? What shoe categories will this insole realistically fit at the specified dimensions? Are the stated metatarsal pressure reduction and heel contact area improvement targets clinically plausible given the specified geometry and material properties? Are there any engineering or anatomical concerns with producing this design across a full adult size range, from smaller women's sizes to extended men's sizes? Deliverables Deliverable 1 — Engineering Review Report (3–8 pages, PDF or Word) by week 3 A feasibility verdict for each of the 10 review areas Specific recommended changes where the design needs adjustment An overall go/no-go verdict: proceed as specified / proceed with modifications / redesign needed Deliverable 2 — 3D CAD Model & STL File by week 4 Fully parametric 3D model in native CAD format (Fusion 360, SolidWorks, Rhino, or equivalent) STEP file export for universal compatibility Print-ready STL file optimized for FDM printing in flexible TPU filament Deliverable 3 — Technical Product Drawings (9 figures, generated from CAD model) by week 5 FIG. 1A: Top plan view with zone labels, reference numerals, and section line FIG. 1B: Bottom plan view FIG. 1C: Longitudinal cross-section with dimension arrows FIG. 1D: Transverse cross-section through metatarsal zone FIG. 1E: Transverse cross-section through heel zone FIG. 1F: Top perspective view FIG. 2A: Hardness zone map with standard engineering hatch patterns FIG. 2C: Detail view of hexagonal antimicrobial perforation assembly FIG. 3: Variable infill density schematic All drawings to be generated from the CAD model and delivered as print-ready PDF plus editable source files. Who I'm Looking For Background in mechanical engineering, biomedical engineering, or industrial design/engineering Experience with flexible materials (TPU, EVA, elastomers) or orthotics/footwear Familiarity with 3D printing processes (FDM/SLS) and Shore A hardness properties Proficiency in 3D parametric CAD software (Fusion 360, SolidWorks, Rhino, or equivalent) — experience with organic or ergonomic geometry strongly preferred Ability to export print-ready STL files and optimise geometry for FDM printing Ability to generate formal 2D technical drawings from a 3D CAD model Medical device or orthotic product experience is a strong plus Able to sign a mutual NDA before receiving project documents Project Details Fixed price preferred Open to bids-separate quotes per deliverable also welcome All deliverables within 5 weeks of document receipt NDA required prior to document sharing How to Apply In your proposal, please briefly describe: Your relevant experience with flexible materials, orthotics, or medical devices One or two similar projects you have completed (even a brief description helps) Examples of 3D CAD models you have produced, particularly organic or ergonomic geometry — portfolio links or screenshots welcome Any experience with technical drawings generated from CAD models Your proposed fixed fee (combined or per deliverable) and estimated timeline Confirmation you can sign an NDA before project commencement I'm happy to answer general questions about the project before the NDA is signed. I'll review all proposals and respond within 3 business days.