We have designed and integrated an apparatus with the ShAPE machine that enables extrusion of round hollow tubing having actively controlled wall thickness. This has been demonstrated for aluminum alloys 6061 and 6111 where the wall thickness was tailored from 1 mm to 2 mm and back to 1 mm along the length of the extrusion by changing the tube inner diameter from 10 mm to 8 mm and back to 10 mm . The attachments discuss the design, integration, and proof-of-concept results.