Lego-compatible hand crank

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Crank arm designed specifically for LEGO Technic cross-shaped axles attaches securely to the round handle part. When assembled correctly, the M3 screw fastened to the crank arm allows the round handle part to spin freely. The SCAD file is provided so users can easily customize the crank arm length and handle dimensions to suit their needs. After eight iterations of refinement, the "+" shaped socket has been precision-tuned for a snug friction-fit on the axle without being overly stiff. Although optimized for my UM2 printer with PLA material at 20 mm/s and 223 C temperature settings, some adjustment may be necessary to achieve a perfect fit with other printers.