I have updated the original design of my drill press. Slider mechanism was changed, so it has now 4 contact points with the lead rods, which makes it more stable and eliminates any wobble when drilling. Also the rack was bit shortened and made a bit thicker to accommodate the slider changes. All other parts remains the same. So if you are updating from the previous version of the drill press, you only need to print the rack and slider.
I have also included DXF files for those of you guys, who would like to make top and bottom plates on laser cutter from steel or plexiglass. The top plate has 8mm holes for rods to go through and be fixed by nuts. Holes in the bottom plate should be threaded with M8 screw-tap.