Disclaimer: I am not a Canadian. Had a couple coins left from a trip to Canada and my wife liked the beaver on the nickel so I tried to make a necklace. I am not sure how these will print on an FDM machine, I printed on an SLA machine in clear resin. The maple leaf on the back of the nickel charm was taken from http://www.thingiverse.com/thing:567539. Note, the uploaded penny version is slightly different from the one pictured--the hole needed to be enlarged to make it big enough to thread on a necklace chain.