Years ago made a version that used a clip. Updated it to use 3 x 8 mm rare earth magnet. Bit of gorilla contact on each side keeps the magnets secure. Reason you put the “stick side” with the thin printed bottom towards the poppy magnet as otherwise they may pull each other out depending on clue. See pictures for what I mean.
MAKE SURE TO PUT MONEY IN THE COLLECTIONS FOR POPPYS IF YOU PRINT THIS AND TELL THOSE YOU GIVE IT TO THEY SHOULD DO THE SAME.
4 total stl files.
3 for the poppy and one for the back clasp.
I print using an MMU2S and do batches to keep the waste tower small. Then I print the clasps as a separate print.
The author hasn't provided the model origin yet.