Well Alex, I tried making this today with no luck. I used 1/8 inch stock and stacked cut 3 at a time with no problem. I had enough to make 3 of them (18 gears). The problem I had was when I tried to cut the space out on the bottom, the first cut went through fine but when I made the second cut, everyone of them snapped off .The plans call for 4mm which is 1/8 inch by the chart I have. What am I doing wrong. I made them the size of the pattern.