If you have an air filter in your Creality K1/K1C, you may have noticed that the rear fan doesn't have much static pressure to push the air through the filter.

A simple solution to this problem would be to replace the original fan with a stronger one.

But if you want a solution using the original fan, then this model will help you.

The proposal is to use two combined solutions: a Velocity Stack with an In-line Pressure Booster.

Velocity Stack: It redirects the air to the fan inlet using the principle of laminar flow, creating conditions for the air to enter in a constant and orderly manner. This increases the flow, reduces turbulence, and, due to the lower turbulence, also reduces noise.
In-line Pressure Booster: The air passing through the fan is accelerated and exits in a spiral flow (vortex). The booster corrects the flow direction, adding more kinetic energy in a single direction, giving the air more force to overcome any resistance. This is the same principle used in jet engines.

Bill of Material (BOM):

4 x Screw M3 x 8mm

To attach the booster to the chassis, use the M3x8mm screws.

To attach the Velocity Stack and the fan, use the original screws.

PS: Don't fits on K1 Max, because of different fan size.

Remix from: https://www.thingiverse.com/thing:4417155 https://www.thingiverse.com/thing:4794537

Creality K1/K1C Rear Fan Static Pressure Booster

0.16mm layer, 3 walls, 10% infill

0.2mm layer, 2 walls, 10 infill

0.2mm layer, 2 walls, 15% infill