[John]

I had this problem too, with a KiCad file. It worked with a previous Proteus file so I compared the two. It’s to do with how Mayhew Labs’ gerber view parses the dimensions.

It appears it expects a leading zero (thou cords?), rather than the default KiCad exports, which is decimal format:

Decimal format: X4.9606Y-3.6575 (buggers up board size and drill location as described)
Leading zeros: X049606Y-036575 (works fine)

So the fix is to write leading zeros if your CAD package has the option. If the developer of 3d Gerber Viewer is looking at this, I imagine it would be an easy fix for the parser too.

[Author]

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