Its a small border to keep dust away. One file that's in 2 parts for smaller printers (or if you want a 2-tone) and another file with the full length guard. The little mouse hole next to the USB-C port is for the capacitor.
My PLA-CF keeps printing 1 mm shorter (I think because of shrinking). So I uploaded both 10 and 11 mm high files. A little taller guard with longer screws is better than a too short guard.
But if you have no problems maybe 10mm is just right.
I only needed a brim for the 1 piece file.
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