There are two kinds to choose from.

Print the pdf file with the protractor with out any scaling and it should fit the printed base. Cut out and glue to the base. Layer on top of it with clear tape if like. Contact glue works great.

Bend the pointer up where the printed marks are on it. May cut it off and use tape so it will hinge well. I used contact glue and a piece of cloth. The cloth will last forever.

Hardest part is cutting out the pdf and glueing it to the base. Use a standard square or known perfect square in lining up.

Check out also my other design. https://www.thingiverse.com/thing:7379117

Should print fine.

Enjoy, Rick.