There are a few reasons this may happen. Your feeder has too much tension on it. Loosening the grip of the feeder may solve this issue. If it only happens during travel, try a lower travel speed. Fast movements can result in broken filament. If it’s happening during regular printing, try lowering your speed. You may have been going too fast or too slow. Try moving the Filawarmer and spool closer to the feeder. For direct drive printers, be careful not to get too close or sharp angles as the hot end moves across the print will result in broken filament.