Casting Corner Frames

These are Corner Frames with dimensions fitting standard 2x3, 2x4, and 2x6 lumber. The side holes are for 1/4 inch bolts. I've placed spaces in the vertical shafts in each corner frame for 1/4 inch square nuts I got at Lowe's. These are to be placed when the print pauses then restart print and they are sealed in place. These are to allow stacking/bolting Cope and Drag together in casting. I used PRUSA's 3D Color Print app to set the stop positions/color change stops. The measurements for these s