Print Profile(4)
Description
The 1 Million Challenge – Gear Crank Fidget
Can you turn a crank one million times?
This deceptively simple fidget hides an insane mechanical challenge:
a 1,048,576 : 1 gear ratio (2²⁰) achieved with an elegant and compact design.
Why this is special
- ⚙️ Extreme gear ratio: 1,048,576 turns = 1 output revolution
- 🔢 Built-in number reading to track your crank turns
- 🧠 Dual-Nutation Bevel Gear system using only 8 gears
- 🖨️ Easy PLA print – no supports required
- 🧩 Tool‑free assembly — no glue required
- 🛢️ Lubrication on the inner shaft recommended for smooth operation
- 🔒 Lockable housing: secure the case using standard 1.75 mm filament pins
Print Recommendations
- ✅ Best results with standard PLA
- ⚙️ PETG also works
- ❌ Do not use Silk PLA – the crank handle tends to break first
This model is part engineering showcase, part fidget, and part endurance challenge.
Perfect for desks, classrooms, makerspaces – and for anyone who loves absurdly precise mechanics.
Inspirations & References
These resources inspired the design and mechanics of my model:
- Thingiverse model: 5461679
- Tutorial Videos:
- Design Tutorial – huge thanks!
- Demo Video 1
- Demo Video 2
- Short Clip
License
You shall not share, sub-license, sell, rent, host, transfer, or distribute in any way the digital or 3D printed versions of this object, nor any other derivative work of this object in its digital or physical format (including - but not limited to - remixes of this object, and hosting on other digital platforms). The objects may not be used without permission in any way whatsoever in which you charge money, or collect fees.
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