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Compact, battery/USB powered magnetic stirrer

Creation's quality: 5.0/5 (1 vote)
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3D model description

This is a portable magnetic stirrer I designed for field titrations. It's perfect for field titrations, or for operating in environments without 240V power, such as fridges or glove boxes.

A draining drawer stores the stirring bars, and can be also used as a sieve/washing tray (25mm stirring bar included).

It should be printed in white so that colour change of chemical reactions can be easily observed. The stirrer can stir volumes from tiny vials up to 1000ml..

Compact dimensions and light weight make it easy to pack the stirrer in with other field gear. This stirrer is ideally suited to work at remote sites, where equipment has to be carried in. It’s small size also means that it could be easily bundled as part of a titration kit.

The lack of protruding knobs keeps the controls protected and, as an added benefit, allows for easy stacking of stirrers for storage.

If you'd like to buy one with dual power (battery and USB) and cable storage, contact me. If you prefer to make your own. Enjoy. :D

It needs:
1.8V DC PWM controller - common on ebay. See pic.
DC motor - eg: Multicomp MM18
A pair of 10 mmØ x 3 mm magnets.
A USB cable.
A Pololu FPF1320 Power Multiplexer
A Keystone 5220, 5219 and 5212 battery terminal.
A bunch a 15mm M3 screws
A 10mm m3 screw
4 m3 square nuts and a few normal m3 nuts.
6 screws for feet/cable clamp.

This is a challenging series of prints, many of which need very effective and carefully considered support. If your printer isn't dialled in, then I'd recommend you find an easier print.

Lid prints upside down.
Doors on their sides.
Drawer right side up.
Baseplate right side up.
Feet. right side up.

Build instructions:
Print parts
• Magnets are a push fit into the magnet bar
• Magnet bar is a push fit onto the motor (Should need a lot of force - eg a vise)
• Cut the end off the USB cable and strip the wires back. Pass the cable through the case and connect positive and negative to the B rail of the multiplexer. Then clamp the cable with the cable clamp.
• Insert battery terminals and wire them to the A rail of the multiplexer.
• Wire from the multiplexer output to the PWM controller, and from the PWM controller to the motor.

3D printing settings


  • 3D file format: STL
  • Publication date: 2020/03/10 at 05:36





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