OSH Park Docs
Altium Designer is a professional PCB design tool.
Generating NC Drill Files
We need the drills exported in the 2:4 inches format or a 3:3 metric format. Check out our Drill File CAM configuration page for settings that we know will work correctly.
For best results, place the outline by itself on the .GKO layer. Remove the mechanical layers from your zip file and only include the files listed on our suggested naming patterns page.
Mechanical Layers on other gerber plots
Altium has an option “Mechanical Layers to Add to All Gerber plots”, which must have all layers unchecked. May footprints contain mechanical “courtyard” or “pick and place” data. If this is added to copper layers, it can create gerbers that will be fabricated with shorts. See Altium’s Gerber Setup for information on how to access this setting.