I like what you did with entry #79 and entry #80 maybe some different font and all caps letters. what if we tried to lose the gear and either just have the caliper or leave the caliper and a micrometer?
Iam totally agree with your feedback about 3D concept, 3D concept will difficult to print on tshirt or on product steel so why iam not make 3d for this contest, but if you want it i can make it.