120mm Fan to 100mm A/C Duct Adaptor

by MCroucher, published

120mm Fan to 100mm A/C Duct Adaptor by MCroucher Dec 14, 2012

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An adaptor/reducer for a 120mm case fan to a 100mm diameter air conditioning duct.

Used on my fume cabinet for my RepRap Prusa Mendel. (Short description: http://www.youtube.com/watch?v=YKh6kgO77Us)

The A/C ducting is standard 100mm ducting, as used in range hoods and bathroom extraction fans.

The fan end is based off a standard 120mm Case Fan aperture and bolt pattern, such as: http://au.element14.com/sunon/kd1212pmb1-6a-gn/fan-standard-120mm-12vdc/dp/9606416


Adaptor dimensions:
120mm x 120mm x 100mm high.

Mounting Holes:
4.5mm diameter holes, suitable for M4 Fasteners. The holes are counterbored for a M4 washer. (Not shown in my photos)

I printed mine with:
0.3mm layer height
2 perimeters
3 solid layers
10% infill

Feel free to reduce the layer height, however this will increase the print time, and it's a long print.

It has been mounted in a cantilever position with the weight of the ducting hanging off of it for 6 months now, and hasn't had any problems.

If you can check your gcode before printing, ensure that the 100mm cylindrical section is printed as a solid wall. I reduced the wall thickness to 1.35mm in this model to allow the wall to be printed in ~3 perimeters. This should reduce the printing time from the original version which printed the inner and outer walls as two concentric walls with a small gap between them.

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Very nice!! But I'm concerned about your E-stop. I'm certainly not an expert, but I have been told that you can damage your control electronics by interrupting the connection between a stepper motor and your control board as you did with your E-stop. Perhaps you could use the E-stop to interrupt the power to your control board instead.