Where is the "Mass properties tool in DesignSpark?
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If you just want to know the 'Volume' for the amount of material used in 3D printing. Then this can be found in 'Nettfab' free software.
To find the 'Mass' you will need to give your model a 'Material' as the 'Density' of each material will be different.
The solid must be a Component. Create a BOM. Change one of the Columns in the Properties Tab - Column Type to 'Material Properties' and the Column Value to Mass