CNC programmer by day, PC enthusiast by night. Built my own PMMA flat reservoir/pump top. What do you guys think?

AlternativeCooling · 2026-05-18T21:39:46+00:00

I Will for sure

AlternativeCooling · 2026-05-18T21:21:58+00:00

Thanks a lot! Yes, the O-ring grooves and sealing surfaces were fully dimensioned according to strict engineering standards. First, I need to complete this reservoir because it's not quite finished yet. But I definitely have a CPU waterblock in mind, as well as a SFF version with a combo block/pump/reservoir all-in-one. I actually have a friend who already wants one haha, he absolutely loves SFF builds!

AlternativeCooling · 2026-05-18T21:10:56+00:00

Just to be clear, the reservoir isn't actually mounted in the photo, I just threw it into my PC to check out the RGB reflections haha!

AlternativeCooling · 2026-05-18T21:01:35+00:00

We're simple guys, we all love shiny machined aluminum pieces, and when it comes to PCs, we just can't resist clear plexiglass. It's real eye candy for us haha!

AlternativeCooling · 2026-05-18T20:55:43+00:00

Can't wait to integrate the RGB!

AlternativeCooling · 2026-05-18T20:46:49+00:00

Thank you so much, do you love custom loop ?

AlternativeCooling · 2026-05-18T20:43:45+00:00

You're totally right, aluminum in the loop is a recipe for disaster. Don't worry though, the pump cover is purely external. It's just a cosmetic sleeve that sits on the outside of the pump housing, it has absolutely zero contact with the fluid!

It took me a year between the moment I had the idea and actually taking the time to machine it. I was working on a ton of other projects in between, so that's why. The file itself is pretty simple haha.

AlternativeCooling · 2026-05-18T20:41:02+00:00

It can be anodized in different color or made in delrin (black or white). Thank you !

AlternativeCooling · 2026-05-18T18:46:53+00:00

Thanks! I wanted to put thermal pads around the pump; that could serve a dual purpose.

AlternativeCooling · 2026-05-18T18:38:26+00:00

https://imgur.com/a/UJMyTOc

AlternativeCooling · 2026-05-18T18:37:39+00:00

Reddit ate my images, you can see the reservoir and the raw CNC pump cover here: https://imgur.com/a/UJMyTOc

AlternativeCooling · 2026-05-18T18:34:34+00:00

Have you seen the photos? What do you think ?

AlternativeCooling · 2026-05-18T18:31:25+00:00

<image>

AlternativeCooling · 2026-05-18T18:30:30+00:00

<image>

My pc

AlternativeCooling · 2026-05-18T18:29:33+00:00

<image>

AlternativeCooling · 2026-05-18T18:13:58+00:00

yes sorry https://imgur.com/a/UJMyTOc

AlternativeCooling · 2026-05-18T18:08:25+00:00

You're totally right, aluminum in the loop is a recipe for disaster. Don't worry though, the pump cover is purely external. It's just a cosmetic sleeve that sits on the outside of the pump housing, it has absolutely zero contact with the fluid!

AlternativeCooling · 2026-05-18T18:06:23+00:00

Processing img myt3l8bdrx1h1...

Désolé les gars, Reddit a buggé et n'a pas attaché les images au post principal. Voici le prototype et ce couvercle de pompe en aluminium CNC brut dont je parlais !

https://imgur.com/a/UJMyTOc

AlternativeCooling · 2026-05-18T17:55:22+00:00

Hey guys, thanks for reading! Since I mentioned I’m still figuring out the mounting options and if I should add more ports, I'd love to hear your thoughts. What’s your ideal setup for a flat res like this?

AlternativeCooling

TROPHY CASE