Real Magnet Turns on and off Science!

Have you ever cursed the day you got a magnet because storage is a headache? They are always gathering half the things in a drawer or taunting your electronic devices with a slow and painful demise. It's even worse if you need to carry one around because it is rumored that magnets can damage payment cards and cell phones. Worry not because the K.I.S (Keep it Simple) magnet is here to save the day! A ferrous (iron, steel, or material that can be magnetized) recycled bottle cap, some PLA, a 3D printer, magnets, and about 30 minutes is all you need to make one of the toggleable magnets for yourself. This is my first public design; I started modeling literally 2 weeks ago. I got my printer about that same time. I hope you enjoy!

https://youtu.be/cwdIPKRy1uI

How it works (from Action Lab):

https://youtu.be/PMma3OJUHhs

For those of you who want to print this here are some tips/instructions:

1. The drawing is designed for ½"x1/2"x1/8" magnets with the north and south oriented across the ½" length. IT WILL NOT WORK if the north is on one large face and the south is on the other.  You can use different shaped flat magnets but two rules must be followed: They must be the same and they must have the large faces split north and south - round magnets are not recommended because then you have to glue them and hope they don't break free and spin. Thick magnets are not recommended because they don't contain the magnetic field lines as well in the off position. I recommend part number B828 from K&J Magnetics, INC (https://www.kjmagnetics.com/proddetail.asp?prod=B828 )if you are in the US but you can take a look there to get an idea of what you need if you want to source them elsewhere (you'll need 2 per KSI magnet). PSA: Amazon magnets DO NOT tell you geometric-magnetic orientation; shop there at your own risk.
2. It is not required but highly recommended that you grease the cylinder of inner2 and outer2 so pressing inner2 in will be easier. There is no further need to prep the parts.
3. place the two magnets together such that the largest area faces are touching and north of one magnet is attracting south of the other. You can check if your magnets have the correct magnetic orientation by rotating one magnet while keeping the face touching; if it starts to repel close to 180 degrees, your magnets are good to go.
4. Insert the combined magnets into the imprinted base of Outer 2. It's a bit finnicky to get them to drop straight but you'll get it!
5. With Inner 2 (recommended greased around the tabs and cylinder) line up the center of “OFF” with the tip of the arrow/triangle on Outer2. Press Inner 2 into Outer 2. I managed to get it to the point where 1 edge is set in and the other is popped out about 3 mm. Making sure that the tab stop on Inner1 is not obstructing the insertion, use pliers, a clamp, or a press to finish the job (you probably cannot do it by hand; I couldn't).
6. Finally, press that beautiful recycled ferrous bottle cap on the bottom of Outer2. Bottle caps do come in AL and they will not work. Ferrous bottle caps are very common though. Please note that if you don't want to use a bottle cap you must use something ferrous to act as a barrier and complete the magnetic circuit in order for the magnet to turn off.
7. It should be in the OFF position when you complete assembly so put the bottle cap end on something ferrous and see if it sticks - it won't if you didn't change anything. Turn it to ON and stick it wherever a magnet needs to go!

This item is not just a magnet. It can be stored more easily, it can be used as an educational tool in science or engineering class, it can be a toy (choke hazard for small children), it can be used with a string to fish for something that was dropped, or it can be a fidget item with your favorite bottle (ferrous) bottle cap. You might not pick up any chicks (although it can be conversation starter) with this one but wandering staples will have nowhere left to hide.