D-71 7″ UAV Airframe (Print Files)

Flight-Tested STL Design Package

The Sentinel Dynamics D-71 is a purpose-designed, 3D-printable 7″ UAV airframe developed for builders who want repeatable results, modularity, and real-world performance — not just a collection of STL files.

This is a validated airframe design, built specifically for additive manufacturing and refined through physical prints, assembly, and flight testing.

Whether you’re a serious hobbyist, engineer, or developer, the D-71 gives you a solid foundation to print, build, modify, and iterate with confidence.

D-71 Assembly Manual

Design Intent

The D-71 was designed around the following principles:

• Optimized for FDM 3D printing (no exotic processes required)

• Designed around common 30.5×30.5mm FPV electronics standards

• Modular layout to support future revisions and customization

• Structural rigidity prioritized over cosmetic complexity

• Practical tolerances validated through real prints and assembly

This is not a concept model — it is a manufacturable airframe intended to be built and flown.

What You’re Getting

This digital package includes:

Complete D-71 STL Design Package

Flight-tested airframe STL files optimized for strength, printability, and modular assembly.

Hardware & Fastener Reference List

A complete, build-ready hardware list so you can source parts confidently before printing.

Assembly Guidance

Clear, high-level assembly direction intended to reduce guesswork and speed up the build process.

Validated Electronics Fitment List

A curated list of flight electronics that have been verified for clearance, mounting, and compatibility with the D-71 geometry.

Baseline Print Settings

Recommended print parameters (layer height, walls, infill strategy, orientation) developed specifically for this airframe.

Component Compatibility & Fitment

The D-71 geometry is designed around the recommended components listed above to ensure predictable fitment and structural performance.

Alternative components may be used, but — as with all additive manufacturing — minor tolerance adjustments may be required depending on:

• Printer calibration

• Material choice

• Slicer settings

This is standard for functional 3D-printed parts and is not unique to the D-71.

Required Additional Hardware (Purchase Here)

(Not included — digital design files only)

• M3 hardware (bolts, washers, nuts)

• M2 hardware & heat inserts

• CA glue (small amount)

• Soldering iron with M2/M3 heat insert tips

Full quantities are listed in the assembly manual for reference.

Recommended Filaments

• PLA+ or ASA – structural airframe components

• TPU – flexible components such as the FC dust cover

Other materials may be used based on your requirements and experience.

Who This Is For

This design is ideal for:

• 3D printing enthusiasts who want a functional UAV project

• Hobbyists looking for a printable 7″ platform

• Engineers who value validated geometry and clear constraints

• Developers who want a base airframe to modify or integrate

Recommended Components

Licensing & Use

All designs and files are the intellectual property of Sentinel Dynamics LLC.

Purchase grants you the right to print and use the design for personal or internal projects. Redistribution of the files is prohibited.