Print size does not match design size

I designed a simple project box in TinkerCad....63mm wide, 113mmlong, 20mm deep. My first time at this. Exported it and them imported the resulting STL into Simplify3d. Printed. The result was a box 57.96 wide, 107.75 long and 19.7 mm high.

I am printing on a Monoprice Maker Select V2. The product is nice just not the designed size and of course doesn't fit the PC board I want to drop in it. Any suggestions, help. This has happened before on earlier versions of the same box. The Grid size is set at 1mm.


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