Spool holder designed to fit on a 1.5"X.75" piece of wood. One of the arm slides to allow the spool to be inserted, then a rubber band snaps it back into position. The only necessary supports are built into the model at the rubber band clip. to assemble, slide the main body onto your wood, then slide the arm onto the rail and secure it with a rubber band. You can either use the clips to secure the rubber band or wrap it around the arms as shown in the picure. Pull the arm back and insert your filament spool, then release it and it will spring back.

Note: The picture is of a late prototype; the render shows the final design.