This is a tuning key for any Lyon & Healy, Salvi, and Venus lever or pedal harp. Prints for about 75 cents and has plenty of space for personalization via embossing of the handle. I recommend you print in PETG for extra strength, but we successfully tested a PLA prototype and it worked fine, it just might not last as long. The provided .gcode and .3mf files have settings for a brim and extra perimeters for the bit to increase strength. 

I highly recommend printing with a brim, otherwise the print will likely come loose and gunk up your printer.