if you used Turbotax (or for that matter any other app) and paid your fees you should be able to print a copy.
However, if for some reason this is not possible you can file form 4506 with the IRS. There is a fee
https://www.irs.gov/pub/irs-pdf/f4506.pdf
if a transcript would suffice, it's free. you can get the transcript by registering online or sending the iRS form 4506-T
https://www.irs.gov/individuals/get-transcript
