Make: published a nice how to on how to make your own speakers in mycelium.
https://makeprojects.com/project/make-your-own-speakers-out-of-mycelium?utm_source=make&utm_medium=widget&utm_campaign=makezine&utm_content=link
Hello, When I was working with mycelium, I sometimes had a rough surface.
To get this surface nice and smooth I used a sanding machine but this was still not 100% what I wanted.
After some talking with the people from the shop I found out that the best thing to do is to sand the mycelium before it goes into the oven. After baking you have a very smooth surface.