This is a simple 3-legged stand I made for my brother. Made from 15mm plywood it's quite large (see pdf) but you can scale the design down to any size required. The height is adjustable and overall the stand is quite sturdy. I gave it a single coat of varnish to protect it from moisture (it's used as a stand for a small telescope)

Provided are all solidworks source files and cutting diagram as metric dxf.