One thing you need to look at is the shape of your logs, creating them as circles will make them difficult to form into stacks that are solid, and can be printed. The problem is the points come together which will stop them being solids, they become zero thickness points. The real logs are generally flattened on the top and bottom too, so it make sense to do it here.
Notice in this gif how the two circles only form a group, but the flattened ones form a Solid Group and you can see the extra ‘meat’ in the middle.
Here I show making one log as a component, then copy from that and Make Unique. This lets me array the unique components and modify them without altering the original. Then use Outershell to form that into one printable solid.
