Although 17lb vellum is the best paper for the projects, it can be difficult to find.  And yes, it must be 17lb.  Anything heavier is to thick and brittle.

17lb vellum goes through the printer the same as copy paper.  You'll find it streamlines the paper-piecing process because it's smooth and translucent, thus eliminating time.  Set your printer to "Best" quality printing and give the ink a minute to dry before you start handling the patterns.   

 

Check Staples or Amazon for the specific vellum and know that you probably won't be able to find it in stores.  Be sure to check delivery times.

Here are some resources and alternatives:
 

• Simple Foundations Translucent Vellum Paper - Connecting Threads

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• Or go to "Etsy"

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• Jam 17lb Vellum - Staples

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• Highly Recommended (As Good As Vellum) - June Taylor "Perfect Piecing" Transparent, Blank Quilt Block Foundation Sheets (Amazon ) 2-day delvery with Prime) Most economical