[Fixittt]

Yes 1 mm endmills do exist, but for any type of fast machining, they just simply cannot be used. Unless you are proto typing in wax of something soft. Copper would snap those things quickly. I have tried carving in copper with 1/16th end mills, and the cuts have to be soo light. It would take forever to do. I have had good sucess and tool life with 1/8 th endmills. They are small, yet beefy enought to do some good depths in copper. That is why I suggested that size to Ben. Now if you had the time, and are using CNC you might get away with 1/16 with light cuts. But I wouldnt recomend it, cause the cost could start to stack up.