What tool do need for this function? Thanks SOLVED

I would like to take a solid made up of mesh surfaces and translate it into a number of shapes that roughly represent the origin shape. I have attached a quick simplified sketch to explain. I feel I have seen this done before. I would like to separate the solid into layers of 2.5mm thickness material. Thanks in advance.
IMG_2686 Small

Use the command Contour to create the 2.5mm slices as curves, then extrude the curves (all at once) 2.5mm.

That is absolutely perfect. Works a treat. Thanks so much