module InterlockEdge(left_cnr, right_cnr, negative=0, nlobes=2) {
INREFFRAME(left_cnr, right_cnr) {
for (lobei = [ 0 : nlobes-1 ]) {
- lobex = (length - thehd[0]*2) * lobei / (nlobes-1);
+ lobex = (length - thehd[0]*2) * (lobei ? lobei / (nlobes-1) : 0);
translate([lobex, 0, 0])
InterlockLobeCore(negative);
}