Sintered Sound: Exploring Acoustics in a 3D-printed Mandolin

This presentation explores the innovative use of selective laser sintering (SLS) technology to fabricate a functional mandolin, focusing on how material properties, energy input during printing, and geometry influence the instrument's acoustic performance. Through the fabrication of the mandolin using fatigued carbon-filled nylon powder and the sPro 60 printer, this study investigates the acoustic characteristics of additive manufacturing (AM) materials in musical instruments.

The mandolin's design, based on traditional geometry with modifications for AM, was segmented to allow for assembly and powder removal. Frequency measurements were conducted using tap testing in Audacity, with taps performed at different locations and captured by front, rear, and back microphones. Results showed consistent fundamental frequencies across all samples, including:

Sample 1 (Bridge Tap - Front Mic): E3 (163 Hz), A♯3 (237 Hz), C♯4 (282 Hz)
Sample 2 (Bridge Tap - Rear Mic): E3 (162 Hz), A♯3 (230 Hz), C♯4 (282 Hz)
Sample 3 (Back Tap - Back Mic): E3 (164 Hz), A♯3 (236 Hz), C4 (257 Hz)
While frequency consistency was achieved, variations in intensity (decibels) were noted, which may be attributed to testing conditions, such as microphone placement and ambient noise. This research highlights both the potential and the limitations of SLS-produced acoustic instruments, offering insights for further refinement in material optimization and design.

Key Takeaways:
Insights into the acoustic behavior of SLS-manufactured instruments
Data on how AM material properties impact sound frequencies
Recommendations for design and material improvements to enhance acoustic performance
This session is tailored to engineers, researchers, and AM professionals interested in pushing the boundaries of additive manufacturing applications in non-traditional areas, such as musical instruments.