PPR Mini Sub-Woofer with Printed Passive Radiator

This tiny subwoofer reaches very low for its size, 45Hz. It does this by using a 3D printed passive radiator. Check out the video:
https://youtu.be/pLwOpjRZ1ew
The passive radiator surround must be printed with flexible filament.
At 180x115x106mm, it will print on almost any printer and only uses ~600g of filament.
It is designed specifically for the Tang Band W3-1876S driver, (the same one used in Hexibase's Hexibox subwoofers). A word of warning: due to the low tuning frequency, and the mass of the passive radiator, this speaker puts out a lot of vibration. You will need somewhere stable to put it and will likely need to bluetack it down!

If you like, it please hit like!

If you are not down with flexible filaments, I have also included a version of the enclosure which will work with a Peerless P830878 passive radiator. Fusion 360 and STEP files provided for anyone who wants to hack about.

Someone will ask the inevitable question; is this better than the Hexibox using the same driver? It isn't better, but it is comparable, and it is half the size and uses less than half as much filament. On top of that, it's got a 3D printed passive radiator, how cool is that? Print both and compare.

Print enclosure with 3 walls and >40% infill.
When printing the surround, turn on "detect thin walls", and/or set extrusion width to 0.4mm.