How to create the bat shirt cuff:

• Print the bat and the holder bar in black PLA. The eyes will be manually inserted, not printed.
• Calibrate the eye holes with a 1.7 mm drill and insert two pieces of white 1.75 mm filament. Alternatively, glow-in-the-dark filament may add to the thrill. You may need pliers to insert the filament in a turning motion. At 1.7 mm bore the filament should stay in place by pure friction.
• Calibrate the hole in the holder bar with a drill to something between 1.8 and 2 mm (depending on your available drills).
• Calibrate the holes in the fork with a drill to 1.7 mm.
• Position the holder bar between the fork arms and insert a piece of 1.75 mm filament as axle. You may have to secure the axle to the fork with glue, e.g. with superglue or Revell Contacta PROFESSIONAL.
• Enjoy!

The bat contour originates from
Fledermaus Vektoren von Vecteezy
I added the eyes. 

As always I include the OpenSCAD source code for you to adapt and improve.

Visit my other designs at
https://www.thingiverse.com/thinger13/designs