CNC clamp hold down for 2 x4 size lumber.

Large hold down clamp which used in qty 4 or 6 can hold down a 2x4 or larger at multiple lengths.

I printed at 0.15 thickness and the part uses roughly 16g of filament. I used a support for both the front and rear overhangs at 30 deg on bambu slicers and 70 or 80 deg on cura for easy breakaway.

Use 2 x M6 bolts with a washer, one 14mm and one 25mm for extra stability - it can work with one 14 at the far end, but not advised due to movement.