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I am currently working on a project and I'm about to get the Gerber files checked by FreeDFM.com. My question is, in my Gerber files, there are a couple that have the extension .C1 and .C2. In FreeDFM.com they want me to specify what these are (Inner copper layers, top layers etc.), but I have no idea what they are.

Any help in determining what these are would be very much appreciated!

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  • \$\begingroup\$ Did you layout the board yourself and generate the Gerbers? Or were they given to you? Do you know how many layers the board is supposed to be? \$\endgroup\$ Jul 30, 2014 at 15:04
  • \$\begingroup\$ Yup! I did the layout and generated the Gerber files of the board myself. The board is just two layers. \$\endgroup\$
    – rmdlp
    Jul 30, 2014 at 15:08
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    \$\begingroup\$ C1 and C2 are probably the top and bottom copper layers respectively. You could download a Gerber viewer to double check. Since the board is two layers, you do not have any inner layers. \$\endgroup\$ Jul 30, 2014 at 15:17
  • \$\begingroup\$ An alternative is importing the files separately on Altium's CAM editor. \$\endgroup\$
    – Sergio
    Jul 30, 2014 at 15:22

2 Answers 2

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Normally the mid-layers in Altium are .G1, .G2, etc. Top and bottom layers are .GTL and .GBL respectively.

Possibly you're mistaking the G for a C, or possibly the program could be configured to use those extensions (though I don't think the version of Altium we're using has that capability).

enter image description here

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  • \$\begingroup\$ Unfortunately, I'm not mistaking G's for C's although I wish I were. These files appear once I export them from Altium! i.imgur.com/ZHIhzaz.png \$\endgroup\$
    – rmdlp
    Jul 30, 2014 at 19:16
  • \$\begingroup\$ They're very small- open them with a text editor and see what's in there. \$\endgroup\$ Jul 30, 2014 at 20:09
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I ran into this also this morning - turned out to be the export from camtastic to gerber setting "Separate Composite layers to individual files" checkbox. It should NOT be checked:

enter image description here

To get there, have the Camtastic file open and go to menu File => Export => Gerbers

Note that I had to save my project in AD19 for the changes to work.

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  • \$\begingroup\$ Done! Look at my original post. Note that I had to save my project in AD19 for the changes to work. \$\endgroup\$
    – Andred
    May 15, 2019 at 17:18

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