3D Printed Sony MDR-ZX770BN Headphone Hinge Fix Rotating Joint Repair PETG

PETG two-piece hinge repair kit for Sony MDR-ZX770BN headphones — restores full ear cup rotation

Part Details

• Part Name: Ear Cup Rotating Joint Repair Kit
• Fits: Sony MDR-ZX770BN
• Material: PETG
• Color: Black
• Quantity: 1 repair kit (2 pieces) — covers one side
• Installation: Remove interior screws, detach metal U-bracket, wrap two-piece repair kit around broken axle with cable through center, reassemble

Why This Hinge Breaks

• The MDR-ZX770BN hinge is the rotating plastic joint that allows each ear cup to pivot and fold flat. Both left and right hinges are prone to breaking at the axle — it is one of the most reported failure points on this model. Once the axle snaps, the ear cup flops loose and the headphones become unwearable. Sony no longer sells replacement parts for this model. This printed two-piece repair kit wraps directly around the broken axle, providing a new rotating joint without cutting wires or soldering.

Compatible Models

• Sony MDR-ZX770BN (left and right sides)
• Not sure if this fits your headphones?
• Message us with your Sony model number before ordering.
• Cross-Reference OEM Part Numbers
• Sony MDR-ZX770BN ear cup hinge joint (no longer available — Sony has discontinued parts support for this model)
• Sony and MDR-ZX770BN are trademarks of Sony Corporation. These names are used solely for compatibility reference. PartsFindr is not affiliated with, endorsed by, or sponsored by Sony Corporation.