All my good caps in one big bank. Sixteen 350uF caps charged to 330V each, with total voltage of 1.3 kV, and stored energy of about 300 J.

Discharged into a coil - 4 loops of 15-strand 0.17 mmdia magnet wire, R = 0.13 ohm, 4 uH. Which made a pulse of current of about 4.5 kA peak.

which develped about 45 V across my home-made abuse-proof 10 mOhm resistor.

The coil survived, but it was close. PLA plate has cracked because of coil self-repulsion. Most likely it was its last pulse.

and the magnet is beautiful. It feels very strong. It is just a tiny bit not strong enough to levitate graphite. I think I am very close to full magnetization of the material.

I made a small switch using salvaged contact bumps from a fridge thermostat relay. The switch made a very loud bang, and welded closed. I can't separate it. I need more robust contacts.