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A custom 3D-printed duct did not automatically cool my graphics card: its first orientation caused thermal throttling in under four minutes. Reversing it brought the GPU to 79°C in a 30-minute FurMark run, matching the result with the case side panel removed—not beating it. The experiment shows why a duct’s shape and alignment matter more than the fact that it is printed.
What the duct was meant to fix
The goal was to reduce GPU heat recirculation by guiding cooler case air toward the graphics card’s fans. With no convenient mounting points on the GPU, the author designed a U-shaped airbox to sit around the fans, estimating about 117 × 300 × 85 mm of available space. The initial layout was intended to draw intake air from the GPU slot area.
The three-piece duct was printed in PETG on a Bambu Lab A1. The build used 118 g of filament and took nearly four hours to print; the pieces were joined with U-nails pressed into the plastic using a soldering iron. These are details of this one build, not requirements for every duct. XDA Developers’ account of the project was published September 14, 2026.
What happened in the temperature tests
The author tested at default GPU settings. He noted that his usual undervolt and more aggressive fan curve produce lower temperatures, but at the cost of increased noise. The reported comparison was:
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| Configuration | Reported GPU result |
|---|---|
| Baseline, case assembled | 82°C after 30 minutes of FurMark |
| Side panel removed | 79°C after 30 minutes of FurMark |
| Duct in initial orientation | Thermal throttling in under four minutes |
| Duct reversed, open side facing the front fans | 79°C after another 30-minute FurMark run |
The reversed duct matched the author’s open-case reading in this test. It did not demonstrate a temperature improvement over that open-case comparison. The results are one author’s measurements on one PC, not a prediction for another case, GPU, or fan arrangement.
Why the first orientation made cooling worse
The author attributed the failure to a choke point at the GPU slot grills: several GPU fans were competing for restricted airflow. He reasoned that turning the duct around worked better because the front fans pushed fresh air into it. Those explanations are plausible interpretations of the observed result, but the project did not isolate airflow as a measured cause.
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A duct can direct air, but it can also narrow the path, obstruct a fan, or make it harder for a GPU to draw air. If the case intake, duct opening, and GPU fans do not line up, the duct may add resistance instead of delivering useful fresh air.
How to judge whether a duct suits your PC
- Check intake alignment. Identify where the case’s intake fans send air and whether that airflow reaches the GPU’s intake fans.
- Look for restrictions. Make sure the duct does not cover fan blades, crowd the GPU, or force air through a narrower opening than the original path.
- Consider the exhaust route. A duct aimed at the GPU intake will not solve recirculation if hot GPU exhaust can simply flow back toward that intake.
- Account for other components. Directing most intake air toward the GPU and CPU can reduce airflow to the SSD, VRMs, and motherboard chipset.
- Confirm fit and clearance. Check mounting points and clearance from fans, cables, the GPU, and other components before printing or installing a part.
- Choose material for the actual conditions. The project used PETG, but it does not establish a universally suitable material or temperature limit for printed ducts.
Case-specific accessories are another option, but their fit is limited to their intended layout. For example, Corsair’s FRAME 4000D PSU-shroud fan scoop is designed to direct air toward the GPU and supports front and side intake fans. Corsair says it is incompatible with a front-mounted radiator because of clearance; its instructions list PLA, with PETG also suitable, and a 15% infill setting. These are instructions for that accessory, not general material-engineering guidance for every printed duct.
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How to test a custom duct fairly
- Record a baseline. Run the same workload you plan to use after the modification and note GPU temperature, fan behavior, and—if available—CPU, SSD, VRM, and chipset temperatures.
- Keep the conditions consistent. Use the same GPU settings, workload duration, ambient conditions, and fan behavior for each run. Changing an undervolt or fan curve at the same time makes the duct’s effect harder to judge.
- Change only the airflow arrangement. Compare the baseline with the duct installed, and note its orientation and any other case changes.
- Watch the whole run. Record temperatures over the full workload rather than relying on a brief reading. Stop if the GPU throttles or temperatures become unsafe for your hardware.
- Check other components and repeat. A lower GPU reading is not a complete cooling win if other parts become hotter. Repeating runs can help reveal whether a difference persists.
A separate fan-shroud project reports lower chip temperatures on particular NVIDIA GB10 systems, including project-owner figures of approximately 18.6°C for the CPU peak and 18.0°C for the GPU peak during an approximately 12-minute Stable Diffusion run on an ASUS Ascent GX10. Its author notes that results vary with workload, ambient temperature, print fit, fan, and vent layout. These project-specific figures are not a benchmark for consumer GPU ducts. The project’s GitHub repository provides its details.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What this experiment does—and does not—show
It shows that orientation can determine whether a duct helps or creates a severe airflow restriction: the first setup throttled the GPU, while the reversed setup matched the open-side-panel temperature in the reported test. It does not establish a typical temperature drop, prove the author’s explanation for the change, or show that a larger redesign would work. The author proposed adding separate intake and exhaust openings, but did not build or test that version.
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