Some part snapping observations

[Roland Melkert]

That's an optical illusion.
Since you can't tell how deep the hole is, the larger edge primitive at the bottom is invisible, you think it isn't deep enough.

But why is this an issue? The connect-primitives do connect to the conhole-primitives allright, don't they?

I'm sorry you are right, it's an illusion.

I changed the color of the 4-4cylc.dat of one of those holes and it becomes visible.