Keyring magnet

thingiverse

A simple keyring thing with an embedded magnet. I use a pair of them to keep my car keys and house keys together. This lets me keep the house keys in my pocket so I don't have them bashing against my knee when I drive. I used these [4 x 8mm magnets](https://www.first4magnets.com/circular-disc-rod-c34/8mm-dia-x-4mm-thick-n35-neodymium-magnet-1-47kg-pull-p6222#ps_0_6417|ps_1_6658) #Printing notes 0.1mm layers look nice, but 0.15 worked fine too. You will need to add a pause to insert the magnets. I did it at the 4.5mm layer change and inserted this GCode: ; Pause to insert magnets G1 X10.000 Y200.000 E0 ; parking position ; Move print head up proportionally of print height to max {if layer_z < max_print_height}G1 Z{z_offset+min((layer_z/max_print_height)*(max_print_height-100)+100, max_print_height)}{endif} M400 ; Finish moves M300 S2500 P1000 ; beep M0 Add Inserts ; User stop with message M105 ; return to current temp When you insert the magnets you need to ensure that half of them are north-up and the other half are north-down otherwise they will repel rather than attract each other! It's a bit fiddly and the magnets want to grab each other so you need to take care. Once they're in the pockets it's not a problem as they snap to the steel bed on the Prusa. I'm guessing printers with glass beds might be more trouble so your mileage might vary.