Reddit reviews BestEquip 800W Industrial Chiller CW5000DG 6L Capacity Water Chiller Thermolysis Industrial Water Chiller Machine for 80 to 100W CO2 Glass Tube (CW5000DG 800W 6L Capacity)
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Model: CW-5000DG; Tank Capacity: 6L; Maximum Flow: 10L/minUse of environmentally friendly refrigerant, cooling capacity is 800WThis water chiller functions compressor delay protection, compressor overcurrent protection, flow alarm and over temperature alarmIndustrial chillers features two modes-constant temperature and intelligent thermostat; Temperature control accuracy can go up to ±0.3℃Water chiller machine is suitable for small water cooling device, specially designed for cooling 80 or 100W CO2 glass laser tube of the laser engraving and cutting machine
Really depends on how much you like messing around with tricks and tips to stay cheap.
I bought the CW-5000 a few months back for $485 shipping included from Amazon, pretty good deal really.
https://www.amazon.com/gp/product/B075F2JY97/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1
This thing is a beast, it's quite large but it works fantastically!
Being pretty much plug and play is of much greater value to me than cycling ice packs in bucket.
I tried the ice method with the K40 I started out with and it works but takes a fair bit of attention and planning.
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Turn this thing on and it chills from 24C ambient to 18C in less than 10 minutes and keeps it there without issue on a 60W tube.
Not having to manage my cooler lets me do the things I actually want to do with the laser.