I want to have a region in my PCB without solder mask while the other regions should have solder mask. I am not sure how do I do it in Altium? Is it by having a Solid (copper) Fill in the Top/Bottom Solder layer?
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The solder mask layer is a "negative", so to remove solder mask from an area, simply place any shape on desired "Top/Bottom Solder" layer.
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\$\begingroup\$ That's placed over a copper pour, so you're getting the copper color rather than the core color in 3D mode. \$\endgroup\$ Commented Mar 17, 2014 at 16:26
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\$\begingroup\$ Not at all, looks nice. \$\endgroup\$ Commented Mar 17, 2014 at 17:46