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BlackberryPi Handheld
(cdn.hackaday.io)
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No, around the keyboard.
You mean the small gaps in the filament?
Those won't go away with sanding unless you go really deep
And personally for a prototype sanding is a waste of time. Get something working as you expect, then roughly design a case, iterate the case, finalize the case design, then finally worry about surface finish.
What the other person said. This is a prototype and looks to be printed with thicker layers than normal (.2mm is the usual.) to save time.