Gerber File Naming Pattern for PCB

Layer Filename
Top Paste boardname.GTP
Top Silkscreen boardname.GTO
Top Soldermask boardname.GTS
Top Copper Layer boardname.GTL
Inner Layer (only on multilayer) boardname.G1
Inner Layer (only on multilayer) boardname.G2
Bottom Copper Layer boardname.GBL
Bottom Soldermask boardname.GBS
Bottom Silkscreen boardname.GBO
Bottom Paste boardname.GBP
Outline boardname.GM1
Slot Holes boardname.GML
Drill File boardname.DRL
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