While I was happy with my first attempt at a wall PC build, I really wanted to try custom water cooling and improve on some things. I know I wanted to do hard lines, no RGB, and try to keep even symetry. I wanted to keep 5.1 sound and stick with AMD for running Linux (Xubuntu 24). I also wanted to make a manual control panel to monitor temps, voltages, and allow for manual adjustments because I like manual. My car has a manual transmission, manual locks, hand crank windows, you get the idea. The build goes into a relatively small room, so in the warmer months I wanted a way to try to dump some of the heat outside. I began this journey in June.

Bending Steel pipe was easier than I expected. Bending steel pipe within accurate dimensions was a lot harder than I expected. I ended up bending a lot of the pipe first, and then screwing down the thing that it was attached to. Much easier that way. I chose 1/2" 316 Stainless tube, and nickel plated fittings. 316 stainless is already 15% nickel so corrosion risk would be pretty low. I'm running plain distilled water treated with Primochill Liquid Utopia. It takes about 3/4 of a gallon to fill up the whole system with all the pipes and four radiators. It also has to be non toxic as the drain valve litterally drains to the ground outside. This also makes re-filling the system a trivial task.

I used Primochill fittings and radiators, which I highly recommend. I do NOT recommend thier valves however. I bought 6 and all 6 had issues. I ended up ordering some plumbing valves that were made in Italy, and they are heavy duty and work great.

I comissioned a custom mount for the reservoirs. I used two so that it can be configured as two loops depending on which valves are open. Being the only clear part of this system, I can tell the water is flowing by the vortex created when the pumps are cranking.

I way over-bought for the pump. One pump can easily power the entire system, but having two means I can manually adjust the flow rate for the outside loop differently than the inside loop. I have not yet cranked both up to maximum at the same time as I'm afraid the pressure might make something explode. I tested one of them outside and it was able to push water up 20 feet of 1/2" pipe and still came out of the top looking like a garden hose.

All of the pumps and fans are powered by the control panel, so I can run the cooling system without the computer even being on. See the image for the description on what the control panel does. I designed and 3dprinted the housing.

The valves can be opened or closed to change the way the water flows through the system. I could run the inside loop using either pump in the event one of them fails.

I made all of the Power supply lines myself with 3d printed closed cable combs because how cool does that look. I also designed and printed the PSU housing in two pieces to hide the wire mess. Over 100 pin crimps. My fingers hurt and there are tiny wire jacket shrapnel all over the carpet.

Why all the screens? They were headed for the landfill anyway, so I got them for free and this was the best use I could think of. The 4 on the top on either side of the PC are powered by a compute board. The PC itself powers the 5 below the shelf and optionally the TV.

I use the system for occasional gaming and general computing tasks. I'm extremely happy with the end result. With one pump running at minimum and only the outside fans going, the thing is silent, which is good because it's right there in my face. I am already planning a version 2 of the control panel with a more sensitive amp meter (PC only draws 6 amps at full load, but the meter goes from 1 to 999). I also want to incorporate some usb ports and maybe an optical drive for some nostalgia. I'll upload any of the 3d printer files if anyone wants them. The parts list may not be 100% complete - I gave up trying to remember every little thing I had to buy to get this together. Maybe I'll write up a blog someday on the control panel. But that would be a manual effort.

I experimented with the outdoor radiators. It's 45 Fahrenheit outside, and the two outside rads dump just about 1 degree Fahrenheit without any fan moving air, which keeps the cpu idling at 95F (35C). The indoor radiators would actually add heat to the fluid so I have no fans spinning. Couldn't be happier.

Uploaded the stl and original autocad files here: https://www.thingiverse.com/thing:7270614

Some of the electronic parts used:
Power Supply: https://www.amazon.com/BRIMETI-Transformer-12V-200W-Constant/dp/B0DM8SZK5T
Power distribution: https://www.amazon.com/Position-Distribution-Inputs-Outputs-PCB015/dp/B0BCWRK72D
Temperature gauge: https://www.amazon.com/weideer-Fahrenheit-Thermometer-Waterproof-Temperature/dp/B0928QY786
Pump/Fan speed control: https://www.amazon.com/Adapter-Controller-Potentiometer-Cooling-Splitter/dp/B0C3JSQWXK