Magnetic polarity reference indicator tool

These tool embeds magnet and visually indicates its polarity. It is helpful for determining the polarity of other magnets and holding them in place for your 3D printing needs.

Design features

• Rounded and chamfered edges for easy handling.
• The magnet is fully embedded and can't be removed (safer than a glued-on magnet).
• Text indicators on all sides
• Sized for a 15x5mm magnet.

Printing instructions

• I recommend flex with 20% infill for easy handling.
• Slice the .stl file to include a pause after the magnet cavity (around 10.80 mm, depending on your layer height).
• I also recommend a colour change at the halfway point (red/blue are standard for N/S).
• To determine your magnet's polarity (for your first one), use a compass. The N indicator of the compass (usually red) will point to the S side of your magnet.
• Tip: Glue isn't necessary for flex material, but if you're using something hard it will prevent rattles
• Note: The .gcode file I've included is upside down so the North side gets the build plate texture. It also has a custom pause algorithm. Upon resume it will extrude a bit and begin a 4 second move to give you time to wipe excess material.

Usage instructions

• You can use this to check your magnets. The N side of the indicator will be attracted to the S side of a magnet.
• I also use this to stack my magnets when I'm putting several into a model, to help keep myself organized.
• Tip: I started a convention of embedding magnets into models so that N is upwards and outwards, and S is downwards and inwards. This helps to make parts interchangeable.

Safety notes

• Magnets can be dangerous.
• Please supervise your children at all times.
• The model is large enough that it should pass the small parts test for children under 3 years old.

Notes

• I designed this model in OpenSCAD and it's fully parameterized. If you'd like a simple modification (i.e., magnet size), send me a message and I'll see what I can do.