Hộp đựng kim bấm (Staple Holder)

Small case for No. 10 staples (the small annoying ones) has witness slits to see how many are left small and material efficient can probably be scaled up for regular staples

Print standing up with the same layer height for best results. 

I printed with a 3mm brim and the final one at .1mm layer. it might be too snug so just increase the cover piece by 0.5% or 1%