Why a solid part is sometimes the worst thing you can print.
A recent client requested a batch of Shaker Mount Pads, which are components designed to absorb high-frequency kinetic energy and protect a structural frame. Their engineering drawing specified MJF PA12. We advised against it and recommended Thermoplastic Polyurethane (TPU 95A) instead.
Here is the material science breakdown of why FDM elastomers outperform rigid powder-bed parts for kinetic dampening.
-The Engineering Flaw (MJF PA12): PA12 is a tough plastic, but it is not a true elastomer. Bolting a high-frequency shaker motor to a semi-rigid PA12 pad means the kinetic energy is not absorbed; it transfers directly into the chassis. Continuous exposure leads to cyclic fatigue.
-The Material Solution (Bambu TPU 95A): TPU is a dedicated energy-dampening elastomer. It boasts exceptional impact resistance and high elongation at break, allowing it to stretch, compress, and isolate high-frequency vibrations without tearing.
-The Internal Matrix (Gyroid Infill): Powder-bed prints are typically solid. Using FDM, we engineered the internal structure of the pad, replacing solid plastic with a 15% to 25% Gyroid internal matrix. This specific 3D continuous wave pattern allows the TPU pad to compress and rebound in all directions, acting as an organic shock absorber.
-Dynamic Surface Generation: To ensure the part withstands compressive fastener stress, we utilised a Concentric top surface pattern, generating unbroken rings of TPU around the mounting hole to prevent shear failure. We then applied Variable Layer Height (compressing layers down to 0.08mm) to ensure the sweeping top curves were perfectly smooth.
The Result: A dedicated, energy-dampening isolator mathematically optimised for real-world physics, replacing a rigid plastic that would have eventually failed under vibration.
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Case Study: FDM TPU 95A vs. MJF PA12 for Vibration Isolation.
Why a solid part is sometimes the worst thing you can print. A recent client