- First set the data you want to append to an unused layer in KiCad so it is easy to tell apart.
- Then export with the “Plot” function and open both gerber files.
- Copy the data area shown in the below image into the file you want as the master.
- The aperture will most likely conflict with existing apertures in this file, so pick a new number by referencing the existing ones.
- Refer to image below on which values to change.
- Save modified gerber file!
- Examine with GerbV to make sure it worked properly.
In the below example I wanted my V1.1 text to be on the soldermask layer, but also wanted to use my copper layer as a direct copy to the soldermask to expose all copper – hence I needed a way to add data to just the soldermask once the gerber was copied. I suppose I could have added the data to the copper layer in KiCad and then tried to find the relevant data in the gerber, but this may be very difficult I am not sure.