This is a tuning key suitable for Lyon & Healy, Salvi, and Venus lever or pedal harps. It costs about 75 cents to print and has enough space on the handle for personalized engraving. I recommend using PETG material for increased strength, but we successfully tested a PLA prototype and the results were good, though it might not last long. The provided .gcode and .3mf files include settings for a base and additional wall layers to enhance strength.

I strongly recommend using a base for printing, otherwise the printed items may loosen and clog the printer.