I made these speaker stands from PLA on a Flsun V400 at about 376 mm high with 40% gyroid infill.

They seem to be able to handle my Kef LS50 Wifi speakers which are quite heavy (10kg) as they include amps and PSUs inside the boxes.

Honestly I'm not sure if the PLA will work long term, at which point I may replace with wood, using the PLA as a saw guide.

Included is a drill guide to help to drill the screw pilot holes wooden shelves at the correct angle.

Edit: improvement in stand strength and rigidity including cable guides to hide the cables inside the stand which could also add further rigidity.

Added feet for 50mm silicone hemispheres to isolate from floor