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Make a useless Amazon mixer useful with a 3D printed propeller
The original was on a short shaft and had no propeller, just a weird flapper. It was only able to mix about half a gallon. It's stepper motor had a totally inadequate top speed but it was powerful enough to turn a much larger propeller. This new large four-blade propeller was the answer. It can mix two gallons with no problem! There are more issues. This mixer rotates counter-clockwise, commercial blades are not available for that. Further, it has a 6mm (rather than 1/4 inch) shaft. Even if propellers were available they would likely cost hundreds of dollars. But designing and printing one on a home 3D printer is no problem. Look how well it works on this 1.45 specific gravity slurry.
Related Pictures
3D printing a propeller for our lab mixer
It has already been drawn using Fusion 360. Choosing Make -> 3D Print, then selecting the propeller and clicking OK handed the 3D geometry off to Simplify 3D, the software that actually ran the printer. Within Simplify 3D the object can be positioned and reoriented on the bed and set to print solid or with infill. A moving slider can animate how the printing will be done, layer-by-layer. I had the printer directly connected via a USB cable so it was just a matter of clicking to start the print. The process begins by preheating the bed and head, the actual printing took about 15 minutes (with printed support under each blade). This fit tightly on the shaft that lasted months of everyday use! A replacement lasted many months more. By that time I had a stainless steel one printed at a service provider.
Variable speed lab mixers at Amazon.com
You need variable speed (not constant speed). Although some have timers these are not useful. The prices range from $100 to $thousands. They do not always come with the shaft and propeller (but it is easy to get a stainless steel shaft). A table-top device may be rated at 20L capacity, for example, but that is for thin liquids. For thick ceramic slurries, it likely will only handle 8-10L (if the propeller is suitable). Double check and question the RPM rating, the cheap mixers use stepper motors (they require minimal electronics) and only get a fraction of the claimed RPM (so they will obviously not mix slurries well enough). These mixers will only be useful with a large propeller having steeply pitched blades. Buying a propeller is not practical because one will likely cost more than the mixer, be the wrong pitch, wrong direction, wrong size. 3D-printing one yourself is the best way (keep reprinting until it works well). If the shipping weight of the package is 15-20 lbs much of that will be the heavy metal base.
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