Hello everyone! Check out my video on how to make a simple router guide to cut perfectly straight dados and other profiles with a router. The key to this jig is made out off scrap wood (MDF, but plywood works too). I do use some store bought aluminum cutting guides as part of the set up in this video, because I already had them in the shop, but the guides can be homemade out of scrap plywood or MDF too. Happy routing!