Real engineering standards, made simple. Design mechanical parts that actually work — verify them against the same methods professionals use, then export print-ready files. No engineering degree required.
Each tool turns a hard engineering calculation into a few sliders and a download button. Members get access to every tool — current and future.
Polymer spur gear designer — VDI 2736 based. Design, verify and export printable gears.
Polymer helical gear designer — helix-angle control, axial-thrust & overlap-ratio analysis, VDI 2736 verified. Design, verify and export.
Size shafts for torque, bending and fatigue — with keyways, fillets and a safety-factor check.
Enter what you know — load, speed, size, material. Plain inputs with clear explanations, no jargon you don't need.
The tool runs the real engineering checks (stress, safety factor, temperature) and tells you if your part will hold.
Download a clean STL for your 3D printer and a PDF engineering report documenting every result.
This isn't a shape generator that just draws a gear. It runs the real polymer-gear engineering checks from the VDI 2736 standard, so the part you print is one you can actually trust under load.
Define a true involute gear from the parameters that matter:
The core engineering verification for plastic gears:
Plastic gears fail from heat, not just force:
Pick your real printing filament — properties are built in:
Make it a real, mountable part:
Take your verified design straight to the bench:
Core gear geometry & VDI 2736 stress results are calculated precisely. Thermal, PV and wear figures are indicative guidance — for critical or load-bearing parts, confirm with physical testing.
Access is handled through Patreon. It takes about two minutes — here's exactly how, step by step.
Open patreon.com/dryrockdesign in your web browser. Tip: join from a browser (not the phone app) to avoid Apple's extra 30% fee.
Choose a tier that includes the tools:
All Designs + Engineering Tools Commercial License
Either one unlocks every tool on this site.
Finish the Patreon checkout so your membership is active. Discounts, promos or gift codes are fine — access follows the tier, not the price you paid.
Return to dryrockdesigntools.com, open any tool and click Sign in with Patreon. Approve once, and the tool opens.
Already a member? Just open a tool and click "Sign in with Patreon". · Just joined and still blocked? Wait a minute for Patreon to activate, then try again.
A short walkthrough of the Spur Gear Designer — from first slider to printed gear.
Everything runs right in your web browser — there's nothing to install, no plugins, and no Java. You just need a reasonably modern browser with JavaScript and 3D (WebGL) enabled, which almost every device already has.
Use an up-to-date Chrome, Edge, Firefox, Safari, or Brave. Keeping it updated (latest version) gives the best 3D performance. Internet Explorer is not supported.
The 3D preview uses WebGL, and the tools use JavaScript — both are on by default. No Java, no Flash, no downloads. If 3D looks blank, enable hardware acceleration in your browser settings.
Works on Windows, macOS, Linux, and modern tablets/phones. A desktop or laptop is recommended for comfortable sliders and larger STL exports.
Tools are members-only. You'll sign in with Patreon (an active tier that includes the tools). See the steps above to get access.
One membership unlocks the full toolbox — and everything we build next. Sign in with your Patreon account to launch any tool.
Sign in & launch →