The imported objects always get a size of 40.96 units high, deep or wide. if you make a cube around michael the cube gets 40,96 units. if you use the same cube for the boots that cube will import as 40.96 units too. because the original cube was the same size for both the boots and michael the scale of the two seperately imported files stays correct. if you wouldn't use that cube while exporting you'd have a michael of 40,96 units high and a couple of boots that are also 40.96 units high. result is that michaels boots don't fit anymore. Splitting up michael and his boots in seperate files will be less hard on you memory during importing.

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