Z-axis bottom bearing block for non-flanged 608zz bearing

I did not have flanged bearings so I have redesigned the block for non-flanged 608zz bearings. Blocks have 1 mm rim to hold bearings. Blocks are a bit wider than original ones just to be more stable. Holes for M3 bolts are intentionally made with diameter of 4 mm to make blocks fit easier. Print it on the side.