Variable Openmod

The most customizable open source headphone in the world.

Variable Openmod Part 2

Circular earcups and an adjustable sliding headband. Compatible with 40, 42, 44, 45, 50, 52, 60, 70mm dynamic drivers!

  • Comfort

    Headband design based on my Static series for maximum comfort. Not to tight, not to loose, just right clamp force.

  • Customizability

    Highly customizable. Designed to work with most 40-70mm drivers. Every single part other than the electronics, earpads and screws/nuts are 3D printed. All files are available for free.

  • Easy to Assemble

    The instructions for assembling the headphones are readily available for free on this website. It is designed to be easy to assemble, modify and take apart. Make it YOUR headphone.

Files available on Printables

Files will most likely be posted to other 3D printing websites. But for now, here is the Printables link to the website.

Variable Openmod Part 1

Variable Openmod Part 2


List of Drivers

Not sure what drivers to choose? Here's a list of drivers to choose from!


Bill of Materials

  • PETG: ~180g
  • TPU: ~20g
  • PJ392 Socket: 2
  • M4x20mm Pan Head Phillips Screws: 10
  • M4 Hex Nuts (DIN934): 10
  • Dynamic drivers: 2
  • Pair JST PH 2pin wiring: 2
  • HM5 Earpads: 2
  • Dual 3.5mm to 3.5mm cable (basically the same type of cable that Hifiman uses)

Where I get the prices: (rounded to nearest 0.5 dollar)

  • PETG: 1KG = $15 [Brand: eSun, Sunlu]
  • TPU: 1KG = $25 [Brand: Duramic3D, Overture]
  • PJ392 Socket: $2 [Aliexpress: Unbranded, Amazon: $6]
  • M4x20mm Pan Head Phillips Screws: $2 [MonsterBolts]
  • M4 Hex Nuts (DIN934): $1 [MonsterBolts]
  • Dynamic drivers: [Aliexpress]
  • Pair JST PH 2pin wiring: $7 [Amazon: Letool 30 pairs, Aliexpress: Cheaper]
  • HM5 Earpads: $4 [Aliexpress]
  • Dual 3.5mm to 3.5mm cable: $13 [Amazon: NewFantasia, Aliexpress: Openheart]

Buying Drivers from Aliexpress

When buying drivers from Aliexpress, there are typically multiple sellers selling the same driver. Make sure you don't get ripped off buying a rebranded a driver for double or triple the price. And of course, make sure you're buying from an established store, not some 2 month old store with no reviews.

Factors to look at when comparing drivers:

  • Magnet shape and size
  • Driver shape and size
  • Diaphragm material and design
  • Color (typically indicates that while similar to another driver, is actually a different driver)
  • Overall driver design
  • Material of the driver body, some are made of metal.

Tips / Donations

You can support me via Paypal:

Though if you want to tip a large amount, I'd recommend checking out the store first.