Adding Structure - Printing in Plastic: Build Your Own 3D Printer - page 203

Insert a Table Bearing Support (Part I or J; it doesn't matter) with the v-groove bearing towards the
top of the Lower Structural Side and insert two machine screws through the holes seen in Figure 12-13.
Figure 12-13. Insert a Table Bearing Support into a Lower Structural Side.
On the other side of the Lower Structural Side, you will use two barrel nuts. Screw the machine
screws into the barrel nuts and tighten them to secure the Table Bearing Support. Figure 12-14 shows
the underside of one of the Table Bearing Supports; notice how the slot on the barrel nut runs parallel to
the machine screw that is screwed into it.