Physical Volume Knob

A 3D printable enclosure for a physical USB volume control knob that plugs directly into your computer. Designed for a rotary encoder with a solid aluminum knob, this enclosure provides a simple, satisfying way to control system volume with a single dial.

This model is part of a complete, buildable hardware project with validated parts, firmware, and step-by-step assembly instructions.

👉 Full build (parts, wiring, code, and assembly):
https://modo.is/b/usb-volume-knob

Description

This is a compact rectangular enclosure designed to house a USB HID volume controller built around a rotary encoder and microcontroller. Once assembled, the device appears as a standard USB volume control and works out of the box on most operating systems.

Features supported by the enclosure:

• Top-mounted rotary encoder opening

• Rear USB port cutout

• Internal mounting space for microcontroller and wiring

• Front-facing status LED visibility

• Desk-friendly footprint (70 × 70 × 40 mm)

The enclosure is intentionally minimal and sturdy, making it suitable for everyday desk use.

The full project includes:

• Validated bill of materials (real MPNs)

• Wiring diagram

• Firmware code

• Assembly instructions

Those resources are maintained on the linked build page.

Printing Notes

• Material: PLA or PETG

• Layer height: 0.2mm recommended

• Infill: 15–20%

• Supports: Not required

• Orientation: Print base flat on the build plate

PLA is sufficient for desk use. PETG is recommended for additional durability.

Assembly Notes

This Printables listing includes only the enclosure STL files.

For the complete hardware build — including parts list, wiring, firmware, and assembly steps — see the full build page:

https://modo.is/b/usb-volume-knob

Files Included

• Enclosure body

• Bottom plate / lid (if applicable)