Inserting a whole in a square

Good Day


I am trying to make a 3D print for a pen blank. The hollow part is filled with a resin the blank is urned on a lathe to form the body of a pen.

To get to understand the program and to print something I want to do one small segment of the blank.

This is a square 20 x 20 mm with a hole 15 mm diameter and 18mm high in the square.

I was following the lessons when first signing up and cant find my way back to them so thats the first question how do I continue with thoes lessons.


Secondly I dragged the sized cylinder into the block But it goes to the bottom and not the top. So need some guidance.



Many thanks


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