Qidi Q2 — Cooling Duct (v5.1 & v6.0 Dual-Flow)

Qidi Q2 — Performance Cooling Duct (v5.1 & v6.0 Dual-Flow)

Summary:
A high-efficiency part cooling shroud for the Qidi Q2. This duct was precision-engineered with CFD (Computational Fluid Dynamics) to eliminate turbulence and provide a focused air stream exactly at the nozzle tip for superior overhangs and high-speed printing.

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### 🌪 CHOOSE YOUR VARIANT: v5.1 vs v6.0

* Option A: v5.1 - Classic High-Flow: Single unobstructed internal path. Optimized for maximum raw air volume. This is the original proven design.

* Option B: v6.0 - The Balanced Flow Redesign (NEW)

* Redesigned Inlet: The fan intake position has been shifted and optimized to feed the internal splitter.

* Internal Splitter: Features an aerodynamic divider that splits the air stream right at the entry.

* Balanced Static Pressure: This redesign ensures that the static pressure is identical in both the left and right ducts. * Result: Perfectly symmetrical cooling. Ideal for parts where consistent overhang quality is required on all sides of the model.

Note on Spacers for v6.0: The v6.0 duct is fully backwards compatible with the original v5.1 spacers. However, I have added new "V2 for V6" spacers with a refined design that matches the new inlet geometry perfectly. I recommend printing the new version for the best look and fit!

🚀 KEY FEATURES

• CFD Optimized: Internal geometry is refined to remove "dead zones" and maximize airflow laminarity.

• High-Temp Ready: Designed with extra clearance from the hotend to ensure stability when printing high-temp materials.

• Pre-designed Supports: The new v5.1 raw.stl file includes integrated, easy-to-remove supports.

• Lightweight & Rigid: Optimized for high-speed toolhead movements.

• Dual-Flow Splitter (v6.0): Internal aerodynamic divider ensures zero pressure drop between left and right air channels.

• CFD Verified Pathlines: New simulation data confirms laminar flow and balanced pressure distribution (check the new gallery images).

🛠 PRINT SETTINGS

• Material: ASA or ABS is mandatory for chamber use.

  • Verified: Successfully tested with PA6-GF30 (Nylon/Glass Fiber) for ultimate heat resistance.

• Layer Height: 0.12mm - 0.16mm (Highly recommended for the smoothest internal surfaces).

• Walls: 2 perimeters (Adjusted for weight savings).

• Infill: 20-40% (Gyroid or Grid recommended; do not use 100% to keep it light).

🔩 HARDWARE & ASSEMBLY

To ensure perfect fit and performance, use the following:

• 1x M3 x 22mm screw — For the main duct mount.

• 1x M3 x 20mm screw — For the fan mount.

• Custom Spacers: Included in the files, specifically designed for mounting the front cladding (external cover).

• Washer / Shim: Included for the fan mounting to ensure a snug and vibration-free fit.

• ⚠ IMPORTANT ASSEMBLY TIP:

  Use only Low-Profile (Button Head) or Flat Head (Countersunk) M3 screws. Standard high-profile socket cap heads (3-4mm tall) may cause collisions with the printer frame due to the tight clearances of this high-performance design.

🌡 IMPORTANT: PID CALIBRATION

After installing the new duct, the airflow characteristics around your nozzle and heater block will change significantly. To ensure stable printing temperatures and avoid thermal errors, it is strongly recommended to perform a PID Tuning for your hotend.

For Qidi (Klipper-based) printers:

1. In the Fluidd/Mainsail console, run: PID_CALIBRATE HEATER=extruder TARGET=220 (adjust the target temperature to your most used material).

2. Once finished, type SAVE_CONFIG to save the new parameters.

📂 FILES INCLUDED

• * Duct Bodies: Versions 5.1 (Classic) and 6.0 (Balanced Dual-Flow) included.

  * Spacers (V2 for V6): Recommended for the v6.0 duct due to the updated design.

  * Legacy Spacers: Still compatible with both versions if you already have them printed.

  * Washer/Shim: For fan mounting.

  * STEP Files: Included for all parts (Ducts, Spacers, Washers).

⚠ A Note on Design & Printability

While further aerodynamic improvements are technically possible, they would lead to much higher print complexity.

More intricate internal geometries often result in:

• Higher risk of print failure due to extreme overhangs.

• Very difficult support removal, which can lead to breaking the internal channels or mounting lugs.

• Need for perfectly tuned printers and high-end materials.

The current v5.1 and v6.0 versions are designed as the "sweet spot": they provide maximum engineering performance while remaining reliable and relatively easy to print for most users.

This is a significant redesign based on CFD simulations. I have optimized the internal geometry to eliminate turbulence and ensure a focused, high-velocity air stream directly at the nozzle tip. Includes M3x22 and M3x20 mounting positions and custom spacers for perfect alignment of the front cladding.

Now updated with v6.0, featuring an internal splitter for perfectly balanced static pressure between channels.