Methods of assembling filters and spacing drum systems thereof

A system comprising:

• a first dispenser configured to dispense a first plurality of segments on a first conveying path;
• a second dispenser configured to dispense a second plurality of segments on the first conveying path;
• a first spacing drum configured to receive a number of the first plurality of segments and the second plurality of segments per revolution of the first spacing drum and configured to release a pair of the first plurality of segments and the second plurality of segments on a second conveying path at a first segment-release spacing and a first segment-release speed along the second conveying path;
• a third dispenser configured to dispense a third plurality of segments on the second conveying path;
• a fourth dispenser configured to dispense a fourth plurality of segments on the second conveying path;
• and
• a second spacing drum configured to receive the pair of the first plurality of segments and the second plurality of segments and a number of the third plurality of segments and the fourth plurality of segments per revolution of the second spacing drum, the second spacing drum configured to release a set of the first plurality of segments, the second plurality of segments, the third plurality of segments, and the fourth plurality of segments on a third conveying path at a second segment-release spacing and a second segment-release speed along the third conveying path, the set of the first plurality of segments, the second plurality of segments, the third plurality of segments, and the fourth plurality of segments released by the second spacing drum forming a filter element.