Originally Posted by
fred_dot_u
Your english is doing just fine.The process I used is adaptable to any shape and is called boolean subtract. One creates the primary shape, then the secondary shape (cylinders in an array) is created in such a manner as to meet your requirements. The two are "booleaned" which is not really a word and the result is as you have seen in my images.Vertical cylinders are easily printed, horizontal versions are much more difficult.I think the challenge is to create the subtractive array to meet your requirements.