KNOB V2.1: Volume Dial and Macropad with VIA & QMK Customization

File Update 6/26/26: Changed Dial to use a bearing reataining screw instead of a bearing pressfit. Old magnet holder still works with this design, it just slides into the center of the retaining screw

File Update 12/7/25: Changed the dial to use a bearing spacer instead of a chamfer to allow the dial to sit more level. Bearing spacer is printed separately and then added to the dial before the bearing.

File Update 5/15/25: Added files for KNOB V2.1 that changes the LEDs used from RGB through hole to WS2811 surface mount and modifications to the USB-C height to make it easier to solder. All KNOB V2.1's now come with QMK & VIA firmware pre installed so you can customize your KNOB right from your browser.

File Update 9/29/24: Long and Short variants added to account for the two lengths of Arduino Pro-Micro's available. If your PCB is marked L print Long Base parts and if your PCB is marked S print Short Base parts. Dial and Magnet Holders are unchanged.

KNOB V2.1 - The Ultimate DIY Media Controller

Elevate your media control experience with KNOB V2, a USB HID device designed for 3D printing enthusiasts. Download the CAD models and start printing your own KNOB today! Perfect for makers who want to build a functional and stylish media controller from scratch. KNOB V2 combines the tactile feel of classic volume knobs with modern functionality, ideal for those who love to print and build their own devices.

Check out the setup video:

Order your KNOB here: https://baselinedesign.tech/products/knobv21

New Features:

• Magnetic Hall effect rotary encoder with 4096 ticks per rotation

• Hot-swappable key switches

• RGB programmable backlighting

• USB-C data and power connector

Continuing Features:

• Precision-weighted dial with a robust roller bearing

• Genuine Gaote brown mechanical key switches

• QMK firmware support

• (USB-C cable not included)

What's Included in the Kit:

• KNOB V2 control board

• 3x Gaote brown mechanical key switches

• 3x R3 keycaps

• 30x47x9 deep groove ball bearing lubricated with ultra-thin machine oil

• Diametrically magnetized magnet

• (USB-C cable not included)

Pre-mapped Functions:

• CW: Volume up

• CCW: Volume down

• Left keypress: Rewind

• Center keypress: Play/Pause

• Right keypress: Skip/Next

• Long press center: Change the backlighting color

Plug and Play: KNOB V2 works natively with any computer, showing up as a standard keyboard and sending media control commands via simple keystrokes. No extra software is needed—just plug it in and start controlling your music.

Assembly Instructions: 

Youtube Video Link

Customization: For those seeking more customization, the Atmega32U4 Arduino Pro Micro control board at the heart of KNOB V2 allows for endless possibilities. The open-source Arduino code can be modified using the Arduino IDE to change volume sensitivity, add new commands, or remap everything to control other applications. The only limit is your creativity!

Source Code: https://github.com/BaselineDesign/BaselineDesign-Knob

QMK Support:

Thanks to the Atmega32U4 processor KNOB is compatible with the open-source QMK firmware, although I have not yet tried working with QMK.

https://qmk.fm/