I just wanted to share this, I just bought a new water pump for my laser tube and flushed the line from air bubbles, after seen a steady water flow with no bubbles I said to myself Im good to go, and I turned my laser/waterpump off, when turning the water pump back on I noticed the hose was empty but it got full of water seconds later, I started cutting abs, 5-7 min of cutting and I heard a little tick sound like glass cracking and it suddenly the laser stopped working........ at the same time I saw just a few miniscule air bubbles on the water pump hose, my water is at 68-72 F , Im guessing I got some air bubbles that I didnt see and when the hot met the cold "pooooof" it cracked my laser on the inside.
make sure your water lines, dont dry when the water pump is off :-(
the crack apears to be on the electrode tip, its filling the laser tube full of water. :-( , tonight I will cry to sleep for not been more careful.
https://youtu.be/1ww1YSN_nmg