How to cut and bend acrylic and PETG tubing for water cooling

How to cut and bend hard tubing made from PETG and acrylic, as the two materials need slightly different methods, we’ve explained the steps for both.

De Waly heat gun warming tubing

Acrylic is by far the most popular material used for rigid tubing in water-cooling systems, but polyethylene terephthalate glycol (PETG) serves a similar purpose, allowing you to show off your colored coolant and offering the ability to include clean bends and a super-snazzy look with your PC.

The bending process can be a challenge, though, and creating your loop will be much more time-consuming than flexible tubing, so this guide is for enthusiasts who want to play with bends and create a unique water-cooled PC.

The two materials need slightly different methods, but we’ve explained the steps for both acrylic and PETG, so you know which one to choose and how to work with it.

1. PETG vs acrylic

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Acrylic tubing is favoured for its higher melting point, meaning it’s less susceptible to higher coolant temperatures, but is trickier to heat and bend. Conversely, it’s much quicker to work with PETG, but it can deform if your coolant gets too warm and it occasionally suffers from kinks when bending.

2. Work out lengths and bends

Pipe cleaners or thin metal rods are ideal for working out the lengths and locations of bends in your tubing. Place one end resting on the tube support inside your tube fitting, and bend the pipe cleaner to the required angle. You can now use it as a template.

3. Use lubricant

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The anti-kinking insert can become lodged inside the tube once it’s bent, so it’s important to use lubricant. Washing-up liquid works well for this purpose, but be sure to rinse the tube thoroughly afterwards.

4. Install insert

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The insert prevents the tube from kinking when you bend it, which will happen instantly without it. Place it so that there’s at least four inches on either side of your bend location.

5. Heat tubing

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Use a heavy-duty heat gun to warm the tubing evenly from 2in away, going back and forth quickly across either side of your bend point. PETG tubing takes least 15 seconds to become malleable, while acrylic takes longer. Too much heat will cause bubbles to form, so practise on a spare section first to find the right balance.

6. Use tube bender

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Once your tubing is heated correctly, feed it gently into your tube bender with the corner of the bend aligned with the centre of the section you just heated. If it doesn’t bend enough, try warming the tubing for a few more seconds.

7. Allow tube to cool

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With the tubing fed into the bending tool, if you’re happy with your workand the tube looks to be free of bubbles and deformities, allow it to cool for 30 seconds, by which time it will be strong enough to handle.

8. Cut to size

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To cut PETG or acrylic tubing, use a hacksaw with a fine-tooth blade, and gently allow the weight of the saw to cut through the tube at your desired location. Too much pressure can crack the tube, so take it easy.

9. Use tube reamer

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Finally, a tube reamer is required to chamfer the outer edge, so the tube slides into the fittings more easily. The reamer also has a tool for scraping the inside of the tube to remove any debris from cutting.

That’s it for our guide to working with hardline water-cooling tubing. If you’re new to the world of water-cooling, then make sure you also read our full guide on how to water-cool your PC.