Magnetic stirrer from a PC Fan?!
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Magnetic stirrers are expensive. Why not print your own?
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The cheapest second-hand magnetic stirrer I could find was €75. That's a lot of dough for some magnets on a motor. So I designed my own, based on some old PC fan's and magnets I had laying around.
You cut off the fan blades with a pair of side cutters and slide the magnet holder over the plastic. Then you can insert the magnets (12mm diameter, up to 5mm thick, but I used 2mm thick. rare earth/neodymium is probably best). The fan screws into the stand with some M4 bolts.
I tried to reinforce the stand with a honeycomb grid, but it's still flexible. That's where the feet come in, which you can screw to the height of your fan. The thread is M10.
Note: I had to print the feet at 99% to match a M10 bolt. The M10 (and M4) thread in the stand is already 5% oversize in the 3MF: by trial and error I found that to be best, but that could be cause by some over extrusion with PETG on my printer. You might want to print a piece of the thread separately (cutting using prusaslicer) to try if it's not too large. If it is, you could trying printing the stand at reduced size.
Note: the magnet holder requires supports. printed the magnet holder upside down (place where magnets go down) to save material.
I printed mine in PETG: Printing the stand takes about 10:30 hours (0.2mm quality). The feet 1:45 for 4 (0.15mm quality) and the holder about 1:11 (0.20 speed).