As another option alongside the skyline diffuser I made a printable QRD diffuser. Operating in 1 dimensions (the horizontal plane), they’re great on walls and at the back of a room.

The QRD diffuser I designed has a primary operational range from 1650Hz up to 8029Hz, with some amount of scattering down to around 800Hz.

The diffuser size is approximately 250×250mm so they can fit on most average print beds. Due to the nature of QRDs though, the Y axis dimensions can be changed in the print setting to whatever diffuser height is preferable.

There are two .stl files for an A and a B diffuser. These should be arranged in a specific order when placing diffusers in a row. The included optimisation guide offers advice on that topic.

If you have any other questions please don’t hesitate to ask.

The purchase includes 2 diffuser .stl files and a printing and optimisation guide

*please note this is for a digital .stl file that can be used with any 3d printer, not a physical object. You will need access to a 3d printer in order to get the physical item.