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 that can be folded and size adjusted, inspired by Sennheiser PX100. It is designed primarly for Koss KSC75 cans 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 (by moving its drivers into custom cans here)

You need four “M2x6mm” screws for assembly. Here's the assembly video;

There are also travel cases you can print and use.

You'll find the recommended STL files in the download. There's also “Customizations.zip” 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 driver.

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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Default Print Profiles

If you don't want to think about the customization options just use the print profiles. They have all the parts with their recommended versions, including the KSC75 adapters. I've added brim to some parts to prevent the occasional warping I encountered. If you have other headphones or want to customize further continue reading below for customized printing.

Customized Printing

Here are all the part descriptions if you want to customize the headband further to your liking.

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 alternative stl files under “Customizations” 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://makerworld.com/en/models/3037978-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://makerworld.com/en/models/2334982-moondrop-old-fashioned-pin-for-foldable-headband

• Pin-MoonDrop-OldFashioned.stl (x2)

To move your Sennheiser PX100 drivers into the headband

Print the cups from the remix here

https://makerworld.com/en/models/1357114-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