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If there is one thing that really bothers me about my iPhone then that I cannot strap a 3D Hubs Marvin to it. JaqLoopie is meant to solve this obvious design flaw. Plugged into any 3.5 mm stereo jack JaqLoopie it will hold on to your (light weight) phone strap charms.
100%, 3 to 5 perimeters, top and bottom layers
At least mine on the ender printed really well and adhered sufficiently to the build plate without brim, raft, skirt or anything.