Thingiverse

Holder for Koss drivers

door Mofapilot

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This is a holder for the exceptional Koss Porta Pro driver.
It should fit following drivers as well, because they are the same:

PortaPro
PortaPro Jr.
SportaPro
KSC-35
Pro-35A

The KSC-75 Driver (PortaPro Driver with a titanium membrane) should be the same size as well:
KSC-75
UR40
Pro-35AT
Pro-35T
KTX-Pro

source: https://www.head-fi.org/threads/which-koss-headphones-share-the-portapro-driver.433365/