A Yankee screwdriver, also known as a spiral or pressure screwdriver, uses a threaded system to turn screws by applying pressure to the handle. This mechanism still makes the tool popular today, even though electric screwdrivers are widely used. YouTuber Robert Murray-Smith has recreated a working model of this tool using 3D printing and has made the free print template available on Thingiverse.
The central element of the screwdriver is a spiral-shaped groove in which a guide pin runs to trigger the rotary movement. Murray-Smith has constructed a double helix for this purpose. Two opposing spirals that make it possible to change the direction of rotation by moving a switch.
The core of the tool consists of a cylindrical shaft with the engraved spiral grooves. In addition to the main shank, the design includes a bit holder that can accommodate standardized hexagonal bits.
The STL files for printing are available free of charge on Thingiverse. Due to the mechanical load, it is advisable to print the screwdriver with high-strength filament such as PETG or nylon.
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