One of my biggest issues is fillets I must not have enough training on the rules and how to know they work cause I can not seem to get them to work every often. and since you have to add them at the end of the design this takes a great deal of time and more than not they just do not work. Can anyone tell me how I can insure not to have problems? I work in all surfacing. Like it will work one way but not another, I have done some research and I can not seem to find any rules to insure it will work. I need a 15mm radius around the whole top edge I know this can be done cause I can machine it that way so if I can machine I should be able to design it. But this is an on going problem for me so if anyone can tell me a way to insure this will always work I would appreciate it lots.