Some new tool head cases to fit Noctua fans for the Qidi plus 4.
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updated November 21, 2024

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Use it at your own risk. This is obviously an unofficial mod. If you damage your printer, the earth stops spinning, or your cat pukes on your bed because of it, forget about a refund from me or Qidi.

This Printable will be updated if I create other designs or modify those. I tried other angles, like a diagonal one or a version, to narrow from a 40mm diameter to a 25mm one and reorient the flow, but both proved less efficient than those designs.

The Gray one is the original tool head case (Courtesy of Qidi)

The Red one is the “wind tunnel.” It has a mono A4x10 Noctu fan on one side and a large exhaust on the other.

The Blue one is a “double A4x10” version. The goal is to blow in with the right one (on the picture, so seen from the back) and use the second one, the left one, to extract the air on the other side so it'll be mounted in the same sense to create a tunnel. I suspect it's best to avoid colliding the two airflows to avoid pushing extra, unwanted, cooling on printed parts.

The Green one is a mono A4x20 Noctua to fit a larger 20mm thick Noctua fan. Green is my goto now and has been tested with 280C long prints without any issue/clogging.

To measure the efficiency of each design, I measure how long it takes for the tool head to cool down from 250C to 50C:

  • Gray:  
    • 250→50C: 335s
    • Fitting is perfect since it's the stock design
  • Red (Mono A4): 
    • 250→50C: 360s
    • Fitting should be okay, to double check
  • Blue (Dual A4):  
    • 250→50C: Measure coming soon
    • Fitting should be okay, to double check
  • Green (mono A4x20): 
    • 250→50C: 275s, clear winner
    • Fitting is still in the fine-tuning phase. I am also trying to make the part stronger for small walls in ASA print

You'll need JS-XH cables to plug into the back of the tool head. Here is a link.
You'll also need some 4x1.5mm round magnets visible here.

You'll need either one or two Noctua A4x10 or an A4x20.

CAREFUL: The A4x20 is a 12v fan, and the tool head board provides only two 24v plugs. You'll need a voltage step-down. I used this one (compact enough)

alternatively, user Rhiz0me pointed that the sunon SUNON MF40202V2-1000U-A99 is feeding natively on 24v.

Mounting is as easy as it gets: cut the head of the Noctua cable, cut the green and blue wires (we won't need them; one is PWM, the other is rpm counting), and solder the JST-XH head. Insert & glue the two magnets (Check polarity before with the tool head ones). Plug the JST in the back, one above the other, if you use the blue (two Ax10) design.

Printing it in ASA or ABS is probably a good option. ASA can get brittle like PLA on small walls, so push the temperature slightly to get good layer adhesion. PETG is also an option, but remember that the tool head can warm up to>300C for some materials. PETG may (?) be too close to the heatsink temperature-wise, especially on the A4x20 design. Use tree (auto works fine) support to print with the Qidi Studio slicer and most other slicers.
 

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