I cannot change via diameter size.

[sellyette]

I want to use 10mil via and 12mil (or 15mil) diameter.

but the diameter is fixed to larger than I sat.

I guess the size is fiexd 31 mil.

how to change this.

[jorge_garcia · Accepted solution]

Hi @sellyette,

I hope you're doing well. You can't make the diameter any smaller because of the annular ring settings. Check out the documentation for this here:
https://www.autodesk.com/products/fusion-360/blog/what-you-didnt-know-about-eagle-restring/

Let me know if there's anything I can do for you.

Best Regards,