Kossel rod jig

I don't have a caliper long enough to measure the rod lengths end to end, so I made this. I place the rod on the jig and tighten the slider until it is held securely. Then measure the gap at the slide block with calipers to determine differences between rods.

Uses an M3 bolt and square nut for the slider. You can probably wedge a normal M3 nut in if needed.