https://digitalpipefitter.com/download
from
https://digitalpipefitter.com/
Might do it for you.
Doesn't print from the trial version, but for the sizes you want screen capture should be adequate to extract the shape.
Elsewise if your using paper and pencil without a drawing board perhaps do it as shown at
Parallel Line Development - Round Pipes
BUT do it oversize and line things up on graph paper to keep things square - then scan and scale in a graphics program.