Where does that fable come from?
A bit of copper somewhere on an inner layer does not help to center the drill at all.
From my eMails with our fab house in germany. I tried to order a PCB just a few months back where I really wanted to avoid even the smallest rest ring on one specific layer. They would not do it and told me to place at least something like 100u around the hole (not sure about the exact value).
I’m really not sure about the drill centering thing, you might absolutely be right there. But I could not get that via manufactured without that restring with our fab house.
An annular ring of 100 um is about standard. Inner pad with no annular ring are a very bad thing for the same reason as misalignment with centering dimples. But it is a very different situation from having no pad on an inner layer at all. When there is no copper and density is uniform, there is also nothing that can push the drill sideways.
At the moment I’m assuming there was some mis communication with your PCB manufacturer.
I agree. HOWEVER… It can help when drilling through polyimide.i didn’t think of this much until a recent flexirigid was showing copper dots when we reviewed the returned artwork.
The fab added it as they said without any copper, the drill bit will tear up the poly around said holes so they would always add it. They stated it is all drilled out as it is the same diameter of the drill bit… THAT only works if their registration is like 0.00001mm accurate… Problem for us… In a few areas we had a key signal running and needed clearance.
Getting the cards in a few weeks so we can see if the circular connector pc-tail holes leave some copper and reduced the voltage withstand…
I would opt to make the F/B-Fab layers not visable by default. I agree that every new board with new components look extra messy. I always turn of these layers in board setup even. The only time when I need the layers is when i want to move some component attributes like resistor values into the silk layer.
I don’t agree with this. Sure, those layers are mostly messy, but it’s trivial to turn them off manually. And in a few of my footprints I’m actually using those layers for very important details. The footprints are for brackets similar to the metal brackets on the plugin cards for PC’s. If that info is skipped, it can be confusing of how to integrate it into the PCB Edge.Cuts layer.
If you find customizations like this important, you can always start new projects from a template. It would be nice to be able to set a (self made or modified) template as the default. Currently, initial project settings are created from some internal voodoo I know nothing about. Also moving these to a (read only?) template would be nice.
I think what Mineotopia is suggesting is that you make a template project where those layers are already turned off, so you don’t have to import settings from another board every time.
Omg I completely forgot. I have once let chatGpt reverse engineer me a python script on my PC which I can call from anywere (global executable) which makes me a brand new Kicad project. I think I can redo this process after adding the the board as well as schematic settings. Than I can start me a project with all the things that I want.
I can even add the bus aliasses I hope. Safes the the hassle from making me the same I2C bus over and over again
Actually, I need to save the 3D STEP file directly to my component’s footprint in the library. Otherwise, if I lose the original STEP file, I won’t be able to view the 3D model on the PCB. Is there any issue for handling this?