Designed in fusion 360.  Files are in proper printing position.  Print all one color with the full assembly file or print both arms and press pin separate for 2 different colors.  Pin is a press fit so ensure proper position then hammer gently with soft plastic or rubber hammer till it is fully seated and flush with the arm as shown in photos.  Must use supports for the pin flange in the arm.  Would recommend at least 25% infill for strength.  Please like, follow, rate and upload your makes.  Check out my profile for many other useful models.  Thanks for viewing.