One String, One Print, One Harp

One String, One Print, One Harp

One String, One Print, One Harp

To exclude musical instruments in the overflowing library of possibility that 3D printing enables would be a disservice to makers and musicians everywhere. For the minds over at [Makefast Workshop], an experimental idea took shape: a single stringed harp. The TuneFast Harp needed enough notes for a full octave, robust enough to handle the tension of the string, a single tuning mechanism and small enough to print. But how to produce multiple notes on a harp out of only one string? V-grooved bearings to the rescue! The string zig-zags around the bearings acting as endpoints that rotate as its tuned, while the rigid PLA printing filament resists deforming under tension. After a bit of math and numerous iterations — ranging from complete reconfigurations of part placements to versions using sliding pick mechanisms using magnets! — a melodic result!

Assembling the harp, the main points to note are ensuring the bearings rotate freely — otherwise, your tuning will be off — and giving each note’s section of string a quick check to ensure even tension. The TuneFast harp works with most standard guitar strings — though steel strings may cause the harp to deform further — and once tightened to a reasonable degree, it’s ready to play! Further fiddling will change the key, but that’s up to the maker-musician’s discretion. Paired with The Hovalin and a few others, you have the makings of the first 3D-printed orchestra. Filed under: 3d Printer hacks, Musical Hacks

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