This acoustic absorption panel is based on the work of juliendorra, found at: https://github.com/juliendorra/3D-printable-sound-absorbers
I have changed the original designs by removing the perforated face panel, shrinking it by 50% (because more/smaller holes are described as better), and assembling multiple face panels/ segmented backing modules/ and a coplanar coiled air chamber into a monolithic, printable assembly of 200mm x 200mm.
The goal of this object is to absorb wide-spectrum sound (noise) for a quieter environment, and to improve the acoustics of a room by removing sound energy that falls onto the face of the panel. Important criteria are low cost, and low weight, which drives the technical shapes and minimal filament consumption of this print. The side with the perforated surface points toward the room.
One assembly requires just under 50m of filament to print, using a 0.4mm nozzle. This panel requires the bending of some default settings in my slicer (slic3r PE), and the side walls are delicate before attaching to a firm surface.
Furthermore, this was one of the first things I made in CAD (and a project that helped coax me into buying a printer), and I'm interested in the subject matter, so there may be a couple of improvements I could make if community interest is there.
I don't have the equipment to perform respectable tests on its effectiveness, but in my unqualified opinion, it works far better than expected.
The cheapest available PETG (tested)
Any (there is very little space to fill 10-20% should be fine)
To get this to slice without deleting walls, you must select:
- Vertical shells = 1
- Horizontal shells = 1
- Ensure vert shell thickness = NO
- Detect thin walls = NO
I personally prefer the additional settings:
- Fill pattern = Gyroid
- Top/Bottom fill pattern = Concentric
Some of the walls and top layers may be a little less than perfect because of the extreme thinness, but one overriding goal with these panels is low cost. The sides and back will be hidden from view after these panels are assembled into a larger structure.
Note: This is very thin/fragile and takes up a large area on the build plate. My printer came with a removable, flexible plate. This allows me to just bend the plate a couple times and it pops off. If you have a hard plate, I wish you luck.