Here's my proposed primitive for the Duplo top stud (fast-draw version). Note that it is 4 units tall, while a Duplo stud is 11 units tall. So the stud needs to be scaled on its Y by 2.75. This primitive is particularly brainless- the stud4.dat has (...) (24 years ago, 15-Jan-01, to lugnet.cad.dat.parts.primitives)
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