Lego-compatible hand crank

hand crank handle fits LEGO(r) Technic shaft


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Crank arm which fits onto LEGO (R) Technic cross-shaped axles. When assembled correctly, the round handle part spins freely on the M3 screw which is fastened to the crank arm.  SCAD file provided so you can make a different crank arm length, handle etc.

It took me 8 iterations to get the "+" shaped socket to be a snug friction-fit on the axle without being too stiff. The file has been tuned for my printer (UM2, PLA at 20 mm/s, 223 C) and may need adjustment for a perfect fit with any other printer.

Materials and methods

- 1 M3 screw, 25mm
- 2 M3 washers
- 2 M3 nuts



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3526ed445612ea0cd5793bf440215baa?default=blank&size=40jorgesgsg added this to the legoos collection ago
05d6c982b3929cb9c5e9cb3ac311f89d?default=blank&size=40Rajapandian Siva Ganesa Karthikeyan added this to the gears collection ago
160d6c0299bbc4c115ed8c2afd53bd5a?default=blank&size=40Arny56 added this to the to print collection ago
160d6c0299bbc4c115ed8c2afd53bd5a?default=blank&size=40Arny56 added this to the Toys collection ago
0a7a1d6c562bdf61aeb21a5878151e8d?default=blank&size=40Aqee added this to the Lego collection ago
Mini jb computerjbeale published this design ago