I like the laser cutting head height adjustment in this video at about 4:54

Lasers
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1

I like the laser cutting head height adjustment in this video at about https://youtu.be/j-b3pomqKkI?t=293&t=4m54s.
https://youtu.be/j-b3pomqKkI?t=293

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not bad

3

Pretty common “ramp test”?

Overkill approach:
You can also build a ramp gauge with a know height and length above and along the table. Set this gauge at a known depth below the head.
Do the math (trigonometry) to determine the correct bed height at any point along the hypotenuse and permanently mark that on the gauge :).
Burn the line and the value marked on the gauge at the thinnest part is the correct depth.

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@donkjr Yeah, I wasn’t really advocating this as the best ramp test. I just liked the quick focus height adjustment. Seems quicker/cheaper than making a moving z-table, although I’m certain there are good arguments for the adjustable z-table.

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@SirGeekALot some time back I caved and bought the LO table as I decided it would cost me that much to make one.
I have a " clamp" table design I have parts for and haven’t built yet.