I no longer use support structures for the screw holes, and I adopted the method of dealing with screw holes that I saw in the Voron design.

Add several screw holes at the bottom, and appropriately increase the thickness of the base plate. At the same time, equip it with nuts and screw holes to ensure that the whole machine runs more stably and reliably.

Use two 608 bearings

4 M3×14 screws
4 M3 nuts