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A Custom Carbon‑Fiber Phone Amplifier by MarkForged Engineer Dan Topjian

Dan Topjian, Senior Applications Engineer at MarkForged, blends hands‑on engineering with cutting‑edge additive manufacturing to solve everyday problems. After encountering a Samsung Note 4 with a less‑than‑ideal audio layout—microphone on the bottom, speaker on the back—Dan designed a custom holder that enhances sound projection and enables speaker‑phone functionality.

Using OnShape for precise CAD, Dan leveraged the Mark One printer’s carbon‑fiber reinforcement to create a lightweight yet robust amplifier. The design directs audio toward the user’s desk, protecting colleagues from an “Eye of the Tiger” volume blast while the microphone cut‑out ensures clear speaker‑phone use.

A Custom Carbon‑Fiber Phone Amplifier by MarkForged Engineer Dan Topjian

The sides are reinforced with multiple carbon‑fiber layers, automatically added by Eiger software, guaranteeing durability without compromising form.

Designed, printed, and tested by Dan himself, this stand showcases MarkForged’s capability to create functional, high‑performance parts in record time.

Specifications
• Dimensions: 76.19 mm × 68.59 mm × 88.89 mm
• Estimated print time: ~32 h
• Material costs: Nylon ~$9.00, Carbon Fiber ~$3.45
• Download: STL file

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