This driver cap can increase volume your Ploopy Headphones output.
There are several variations, but all now utilize aligned magnet holders, moved 1.6-1.7mm closer to the driver.
To fit it in, you will need to cut off some perimeters — which amounts to about 0.5 mm — from both sides of inner holes of your Driver Backs.
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Please, do not attempt to do this with you driver assembled, unless you are completely nuts
It doesn't change the signature much (but it does), and provides about 20 dB of volume on the same Ploopy Amplifier.
Xylite engineered an alternative approach, with custom driver backs
https://www.thingiverse.com/thing:6560552
The author marked this model as their own original creation.