Please excuse me if this has already been posted but I am new to the forum and have'nt had time to search all the archives. I am new to MYOG and have started with some alcohol stoves, I am working on a Ti cone with beer can pot and stumbled on this program for drawing a frustum on a computer. I have not tested it yet but thought I would post a link so others could try it. I will draw the fustrum onto card, then use the card as a template for the Ti foil. Pencil on a piece of string is proving a bit uneven.