This is a 3-place smart card holder with quick release for all three cards. The front and rear cards are ejected by pushing on the cards through the viewing windows. The center card is ejected by pushing on the button at the bottom of the holder. The loop on the top corner is sized for most clip on and snap on lanyards etc. Model has a built in custom support that must be cut off. Print with the spring slots down as shown.
Also included a .STEP of the card holder to make it easier to customize.
MonoPrice Maker Select V2
Springs are tuned for PETG. Must be able to print 0.25mm gaps. Should function just as well printed in Nylon or Polycarbonate, but will be extra stiff if printed in PLA or composites. May need to gently pry the springs loose with a knife.