Little add-on for i2 prinetr. I have spools with 2 sizes (32mm and 75mm) of inner diameter hole. This holder consists of pair frame holders. and two spool holders. Rotation is provided by 2 bearings 608ZZ. This ad-on can be mounted without remove any parts of printer. additional needs: 2 bearings 608ZZ, 10 M8 nuts, 2 M8 nuts (higher) - to append to printer's frame, 4 M8 washers, 2 M8 washers (big) - to spool holder, threaded rods:2 pieces (cca 150mm length) , 1piece cca 300mm length - may vary according to printer's frame width) galery description 1 - before using spool holder 2 - mounted frame vertices 3 - spool holder printing in progress 4 - spool with 32mm hole 5 - spool with 75mm hole 6 - fully assembledThis thing is easy to print. All parts are solids without any bridges. Assembly: On front (or rear) frame threaded rod put higher M8 nut, tighten and then put the 150mm threaded rod and fix posistion by additional M8 nut. Place a bearing into frame vertex (left and right piece). and U can mout it o the rod nut-washer-frame vertex piece-washer-nut. Bearings will be on the top of the frame vertex and on the external side. The spool holder threaded rod is mounted "in situ". nut-washer-bearing- - - -nut-washer-spool holder-spool-spool holder-washer-nut- - - -bearing-washer-nut. The left or right pieces are not marked - it can by vary acording to mount position.