One of the quality improvements we have made to our Mark One printer is an increase to the tension we keep on our fiber spool.  This eliminates the possibility of having the spring-like fiber filament “jump” off the reel as it is currently prone to do.  We did this by adding a second spool tensioner (the thin plastic sheets at 45-degree angles).  I created this fixture so that workers at our factory will consistently install these at the proper angle.