Double sided Notch Decoder.
0.2mm or 0.4mm thickness
By placing the sharp end of the Decoder on the axle inside the lock, the operator can detect flat spots or grooves as they spin the wheels. These changes reveal the lock's combination.
Print with 5 walls/100% infill
Print in 0.2 mm layer height. Remove from build plate with caution, the tool is very thin.
Use stiffer materials such as PLA, PLA-CF.
ABS or PETG are more flexible which is bad for printed lock picks.
Check out Lock Pick Tensioners, Rake, and Notch Decoder too:
https://www.printables.com/model/1103439-lock-pick-tensioner
https://www.printables.com/model/1110171-rake-lock-pick
https://www.printables.com/model/1105728-lock-notch-decoder
The author marked this model as their own original creation.