[OLD] Dremel Tool Centrifugal Blower

UPDATE 11-23-2025: If you are looking for a higher performance blower in terms of CFM (and less filament usage) I uploaded some propeller models for this same Dremel.

Again, exploiting the conveniences of using Dremel tools for the wrong purpose…

I think this is only compatible with the Dremel 7760 (Dremel Lite) due to the shape of the chuck and the threads of the nose cap. It may be compatible with other models of Dremels, but I can't guarantee compatibility.

Anyways, this is a 13 bladed, 60mm impeller which is somehow my first semi-open impeller based blower I have ever made. It even features a mildly separated duct from the impeller to hopefully help boost the centrifugal force by reducing turbulence from the impeller. The tolerances I designed aren't great, but they are good enough to give this thing some decent velocity behind it! Now I don't want to false advertise this thing but it is a pretty good amount of air in my opinion. It also has a decent suction force behind it. I am aware that this isn't perfect as the top and bottom shroud are sealed by a simple press fit. The impeller stays on the shaft mostly through gyroscopic forces and reaction torque, as the fit is pretty loose on the chuck. Outtake ⌀ -23mm | Intake ⌀ - 47mm

Use either the short intake or long intake top, depending on if you want to be able to use the suction this blower creates or not.

ASSEMBLY: Unscrew the nose cap from the Dremel tool, and screw on the blower shroud bottom. Then, push the impeller onto the chuck. Lastly, take the blower shroud top and line up the rectangular pegs and holes. It should be a pretty tight press fit, but if you need to get the top off later use a flat blade to pry it off.

(Yes, the print quality is still awful :/)