Koss KSC75 Foldable Headband & Travel Case

New (July 2026): Reworked the sliders to fit and slide more smoothly.

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This is a headband, inspired by Sennheiser PX100, can be folded and size adjusted. It's designed primarily for KSC75 but can be used with the following headphones. Don't forget to download/print correct adapters for the model of headphones unless you're using a KSC75.

• Koss KSC75

• Koss Porta Pro (download PortaPro adapter here)

• MoonDrop Old Fashioned (download MoonDrop adapter here)

• Sennheiser PX100 (if you move its drivers into custom cans here: https://www.printables.com/model/1277297-px100-cups-for-custom-headband

 You need four “M2x6mm” screws for assembly. Assembly video is here:

There is also a clamshell travel case you can print.

You'll find the recommended STL files in the download. There's also “Customizations” folder that allow you to download customized versions of the files, such as sliders that provide lower/higher pressure on the ears, a longer comfort strap, or KSC75 pins that fit tighter to the drivers. 

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note: the “KOSS” logo on the travel case is not included in the files, don't want to violate trademarks and get the model removed unintentionally.

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 ==== PARTS TO PRINT ====

Main Parts

1. Print the Arch and the Arms.

• Arch.stl

• Arm-Left.stl

• Arm-Right.stl

2. Print 2 of the sliders. The recommended version is the “Low Pressure” version, but check “Customizations.stl” for higher/lower pressure options.

• Slider (ez) - 2 - Low Pressure.stl (x2)

3. Finally, print two housings.

• Housing.stl (x2)

4. (Optional) - Print the Comfort Strap out of TPU. The headband works just as well without the comfort strap, so this is optional.

• Comfort Strap (TPU).stl

To attach KSC75 cans to the headband

Print 2 pins. The recommended version is "Pin-KSC75-Tight.stl", but there are 2 other versions under "Customizations" that make an even tighter fit to the drivers.

• Pin-KSC75-Tight (x2)

To attach PortaPro cans to the headband

Print two adapter pins from the remix below. The recommended version is “Pin-PortaPro-Standard.stl”.

https://www.printables.com/model/1778264-porta-pro-connector-pin-for-the-foldable-headband

• Pin-PortaPro-Standard.stl (x2)

To attach MoonDrop Old Fashioned cans to the headband

Print two adapter pins from the remix here

https://www.printables.com/model/1580439-moondrop-old-fashioned-adapter-pin-for-foldable-he

• Pin-MoonDrop-OldFashioned.stl (x2)

To move your Sennheiser PX100 drivers into the headband

Print the cups from the remix here

https://www.printables.com/model/1277297-px100-cups-for-custom-headband

• PX100 Outer Cap Left

• PX100 Outer Cap Right

• PX100 Inner Cap (x2)

For the travel case with hinged cover

• Case Hinged Version Bottom

• Case Hinged Version Top

• Case Hinged Version Plugs (x2)
  (you also need a piece of filament to put into the hinge)

For the travel case with friction cover

• Case Friction Version Bottom

• Case Friction Version Top