Center-Drill V-Vise - drill dead centre through round stock, quick-release (100% printed)

Lay a rod, tube or dowel from 6 to 40 mm in the V. Turn both wing nuts a quarter turn so the wings point along the bridge, drop the bridge onto the workpiece, then turn the wings back across the bridge to lock and give them a firm twist. The cone-shaped drill bushing presses the workpiece into the V and guides the bit exactly through the centre line. - Holds round stock from 6 to 40 mm

- Quick-release wing nuts with an interrupted thread: no endless spinning, a quarter turn frees or locks the bridge

- 8 swappable drill bushings: 2, 2.5, 3, 3.5, 4, 5, 6 and 8 mm, size engraved on each

- Every bushing has its own labelled storage pocket in the base, with a push-out hole underneath

- Bushings screw into the bridge and seat on a 45 degree cone, so they always sit centred

- mm scale along the V and centre marks on all sides

- Clamp slots in the flange to bolt it to a drill press table

- A channel under the V lets the drill break through cleanly

- Fully printed: studs, nuts and bushing threads are all printed, no metal hardware needed

Not tested yet - designed and checked in CAD (all threads, the quick-release nuts and the full 6-40 mm range checked for fit and clearance).