I'm starting 3D printing and there is a lot I don't know about it. Not the least is how to get a good print out of my machine. Sharing your little tricks will be greatly appreciated! Adam, you hit the nail smack dap on the head with what I struggle and I still do after reading your explanation. If the hole is a cone shape hole I thought that it will build itself because of the slope. What I don't know is how to 'bridge' the top of the hole if it is not cone shape. How will putting a membrane will solve the problem since the membrane needs support too. This a cross-section of what I'm talking about. How would you do the small cylinder?