Fixed Gantry CNC with good accuracy and rigidity but for a higher price than the usual CNC's on the site.

Large Core XY 3d Printer W/fixed build plate

Combines the layout factor of a CoreXY while using Cartesian logic. The design has a fixed build plate - moving an X/Y frame on the Z axis enclosed by an outer main frame.

Super Rigid CoreXY 3D Printer

I got lucky enough to purchase aluminum extrusions and linear motion components (and nuts/bolts/etc) at scrap metal prices when a bunch of industrial automation equipment was decommissioned. The only problem is that the aluminum extrusions are not metric sizes... they are the 1.5"x3" 80/20 series. It has presented a few challenges but nothing too bad.

This will be a fixed bed, v-slot implemented X,Y,Z axis gantry style 3D printer.

Similar to C-Beam Machine build, but with inverted Y-axis assembly to shield drive screw. Integrated XZ gantry can be fixed to any solid surface. Build dimensions are 36" x 36" x 6".

basic start to design of cnc machine

Use of V-Slot for frame and rails with option to use identical 500mm uncut lengths: 8 * 20x60 x 500mm 8 * 20x40 x 500mm 7 * 20x20 x 500mm (2 cut into four identical 125mm pieces for filament holders) Use of uncut 500mm rails obtained through use of 12 joining plates for use as spacers. Alternate approach is to trim two 20x40 and 1 20x20 rail by 6-8mm each. Build volume ~400mm cubed (with dual extruders). Use of only openbuilds components! Currently in design phase...