Hi

I have a volute geometry that I obtained from another software which consists of surfaces only. I want to Thicken the surfaces for manufacturing, 1 surface is thicken with no porblem but there are 2 surfaces (attached) that I have problem in using the Thicken feature as the surfaces geometry is complex. Is there any way that I can sort out this issue? is there any other way to thick these surfaces?

Any comments is highly appreciated