Small water pump for N20-like motor
Description
A small water pump for toy electric motors with 0.9-1mm shaft, 12mm casing diameter and two flat areas on opposing sides. Something that looks like a "N20" motor (example of such motor: https://www.ebay.com/itm/Mini-MNB-N20-DC-6V-12V-33500RPM-High-Speed-Micro-12MM-Motor-DIY-Toy-Hobby-Model-/322643405199), but mine are extracted from junk so I don't know if that's the exact type, and it could be longer without any problem. After printing the rotor and casing make sure the rotor turns freely inside and if not make it a bit smaller or grind it down, it should be 0.6mm or less away from the casing. Then remove it and put a glob of thick lube on motor's shaft so the water doesn't go in and reinsert the motor and the rotor. I also highly recommend gluing the rotor to the shaft with a SMALL drop of superglue, preferably of the high-viscosity variety. Water resistance can cause the non-glued rotor to come loose even if it seems to work fine in air or in short bursts. If it spins ok glue the motor in place and afterwards glue on the top making sure the glue won't go into the pump but goes all the way around the joint so it is more watertight. It has 4mm hose barb tips for use with standard 4mm i.d./6mm o.d. aquarium hose, but insert carefully as they are optimized for not obstructing water flow rather than being very strong. This thing is good enough for a small desktop water fountain or a car swamp cooler water recirculation pump for something like this: https://www.banggood.com/12V24V-35W-Dual-Input-Mini-Air-Cooler-Fan-Water-Ice-Evaporative-Portable-Air-Conditioner-p-1261035.html?admitad_uid=915fcb44b9c0adef45a8f89cfe695c4b&utm_content=615449&tagtag_uid=915fcb44b9c0adef45a8f89cfe695c4b&ID=49554&cur_warehouse=CN. It is generally best to print the casing first, then rotor and the lid last to adjust for tolerances with minimum loss of plastic.
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