TwinSpin - Geared Tool Cups (Unprinted Prototype)

**UNPRINTED PROTOTYPE — physical fit and motion require testing.** Two exposed gear rims link a tall pen cup to a divided small-tool cup. Turning either cup turns its partner in the opposite direction. Pen and small-tool use only; no load rating. Fit, gear friction and tip stability untested. Includes separate printable parts and an assembly guide in the ZIP. Hardware is not included. The images show actual model geometry, not print photographs. Digital STL checks passed for closed mesh, consis…

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