3D printed banjo uses party balloon as its sound box to explore how air changes the tone
a party balloon becomes A hands-on lesson in sound
A 3D printed instrument by Co:Creation Lab uses a replaceable party balloon as its sound box, turning the physics of resonance into something users can adjust and feel. Called the Balloon Banjo, the small playable object combines seven printed components with fishing line or nylon strings and a conventional round balloon, creating a DIY instrument that doubles as a simple experiment in acoustics.
Plucking a string sends the sound into the balloon, where the volume of air affects the resulting resonance. Inflate the balloon more or less and the character of the sound changes; alter the tension of the strings and it shifts again.
The way the instrument is made encourages users to modify the object. The balloon can be replaced with one of a different size, while the fishing line or nylon strings can be exchanged for different thicknesses. Each change becomes another small test.
all images courtesy of Co:Creation Lab
a printable instrument built for experimentation
The banjo consists of seven distinct printed parts and 19 pieces in total: a neck, left and right flanges, two bridge components, seven pegs and seven peg sockets. Once the sockets are fitted into the body, the instrument is assembled with plastic screws that can be turned by hand. There is no metal hardware, glue, or screwdriver, and the instrument can be taken apart again. The construction turns assembly itself into part of the design, while the absence of permanent fixings makes experimentation easier. The same object can be assembled, modified, disassembled, and rebuilt without committing to a single configuration.
The technical instructions reveal a similar attention to the behavior of the printed material. The model is designed around PLA, using a 0.4 mm nozzle, 0.2 mm layer height, and 15 percent infill, with an estimated total print time of around 11 hours. The pegs and sockets use a finer 0.16 mm layer height because they carry the fit tolerance. The designer specifies a 0.15 mm clearance for PLA, with roughly another 0.05 mm allowed when printing in PETG.
Even the orientation of the parts is determined by how 3D printed layers behave under stress. The neck is printed flat because the direction of the layers affects its strength; printed upright, it can snap along a layer line once the strings are tensioned.
the 3D-printed Balloon Banjo uses an inflated party balloon as its sound box
the playable instrument combines a printed body with colorful nylon strings and hand-turned plastic pegs
the balloon sits inside the printed frame, where changes in inflation alter the instrument’s tone
with the balloon removed, the printed frame reveals the structure of the instrument’s sound box
its individual printed components and reassembled without glue or metal hardware
project info:
name: Balloon Banjo
designer: Co:Creation Lab | @cocreationlab
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