My DIY alcohol stove. Inspired from a post I found on BackpackingLight a while ago; made from an aluminum beer bottle (thicker aluminum than cans), gradually crimping the rim with needlenose pliers to form a cone.
It puts out a tightly focused flame, which works well with small diameter cups & pots.
It's quite sturdy and I like that it has no moving parts or small holes which could clog.
Another picture along with my windscreen, etc. The entire kit pictured here fits inside my pot (except for the reflectix, but I suppose it might too - I haven't tried).