Pico 4 passive sound amplifier/enhancer extension (3 sizes)

Some say the sound of the new Pico 4 is great with good bass, some say it's rather poor like me. Different opinions it seems, but the biggest difference are likely due to different head- and earshapes. The sound-exit of the Pico 4 is too far away from my ears and can't deliver it's potential. This extensions enhance it quite significantly.

This is the non-free version with different sizes and I recommend to try the free version first to check if it works for you and your printer:
https://cults3d.com/en/3d-model/game/pico-4-passive-sound-amplifier-enhancer-extension

This download includes the M-, and optimized L-size.

Update: I've made a version 2 for the L-size only. Contact me, if you need another size, otherwise L is recommended. It closes the gab between in- and output and is a bit easier to print with 0.3 mm gap instead of 0.2 mm, but it needs support at the bottom. It produces more bass and increases the volume considerably.

The print-orientation is already set and PETG or similar (more than) recommended. PLA is possible, but breaks easily and will get loose soon. Print S and M without and L v2 with support. A brim is recommended. Better print both sides separately and one first to check if it works.Open the clip carefully with a nose plier like in the picture and attach it to the Pico 4 in the right orientation with the sound-exit inside-down. If the close-mechanism doesn't open first, use a sharp knife or razor blade to open the gab.