CH1-C DIY Closed back headphones

Headphone design based around the Peerless Tymphony 50mm driver.

The project is an experiment in closed-back cup design, I wanted to test out an idea I had of using 3d printed infill patterns to control resonance within the cup, rather than relying on other materials. The goal was to make them cheaper and simpler to construct. It seems it can be made to work, and it sounds alright  but it isnt where I want it to be, I imagine this would work better with a different driver that reacts better to the rear enclosure. The files are here though for people that want to try it.

I have tried to document what I have learnt here https://www.head-fi.org/threads/diy-3d-printed-headphone-journey.979090/

The size of the cups was intentionally scaled so that they would fit the wonderful Capra Audio headband and Satyr3 yokes.  This means that they will also fit a range of third-party headbands found on Amazon and AliExpress.



BOM:
Drivers - Peerless 50mm
Pads -  Aliexpress Leather LCD style pads 110mm
             Aliexpress Fenestrated "punching" AT style pads 105mm
Cable Connectors - PJ392 3.5mm
Screws - FHCS + Pan head M3 8 and 10mm
Threaded Inserts - M3 Heat Set
Washers - M3
Tuning Material - 1.5mm(1-2mm) 30% wool blend felt

Instructions:
- Make sure to print the gasket part in TPU
- For the rear cup, set the supports to manual and add them only to the centre. Print it with 0 bottom layers, a 5% gyroid infill (based on 0.6 nozzle) and add enough walls to bind the posts to the infill and cup wall based on your nozzle size.
- Cut the 1.5mm felt into a 50mm diameter ring to sit behind the driver and seal the gaps as shown in the photograph
- If you use the Capra Audio headband, then depending on the length of screws that you use, you may need to place some m3 washers between the yokes and the cups to increase the clearance slightly.

The Measurements provided are from a custom rig and so aren't comparable to anything else other than the measurements given, as such, I've provided measurements from other headphones to be used as a known reference.