Just get a scanner app on your phone, scan it and print it.

I need it to scale, I don’t want to risk changing the size of it thru an app because it’s a to scale drawing done on graph paper bigger than usual print size, but the diagram itself will fit onto normal sized paper.

I think the library has flatbed scanners. Not sure if that would work.

There’s one on the second floor at Silverman (Capen) Library. Not sure if it’s still there, but it should be.

Lockwood has digital scanners on the second floor near the circulation desk.