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Would it be better if you only had the grid on the top surface and printed some lugs around the edge so that the table can be secured solidly to the mill table? Not sure if it would increase holding power but you would eliminate some of the movement from the lower seal rolling and compressing.
That looks good, I like the provision for stops and also tucking the vacuum outlet out of the way.How deep did you make the 4mm grooves?Also on the second 3D image you show 5 of the squares with holes, is there a purpose for these, maybe to take something to stop very thin work sagging