An attempt at a desktop 3-axis to be GRBl controlled ... or an epic failure in the making. Time will tell. A 12" x 20" footprint shooting for an 8 x 12 or so work area. Bunch of 1/2" x 3" bar stock, some 1/4 " angle stock, lots of 1/4 shoulder bolts set in .247 holes. Base assembled, slide rails tentatively installed, little tap here and there and best as I can measure they are square +/- .001. At least the slide moves, no noticeable binding with 'Pinky' (technical term) pressure.