I searched for a wire gauge to print but nothing found so I made it myself.

The model is exact according to the AWG standard (American Wire Gauge)
Sizes are from AGW-0 to AWG-30 but it is the accuracy of your printer how
accuracy the sizes are.
The gauge number refers to the size of the diameter cut-out next to it.

I printed it in PLA but the finest AWG 25-30 are pretty closed.
Its also a good print for testing your printer and settings

Use:

• With electric wire, remove the plastic insulation because you only measure the core
• The horizontal gap at the outermost point is the diameter which is referred to by the
  gauge number. This is where the wire is placed to determine its size.
• The circular section acts as a run through for wire that is capable of fitting through the
  gap. It allows the wire to be easily removed after passing through the gap.

When googling "wire gauge" you can find other information and the sizes of the AWG standard.

I appreciate if you upload your print