Runner Balancing – Single Runner vs H-Pattern vs Artificial Balance

8-cavity runner layouts seen from the parting line. Press Play or drag the slider to compare how evenly they fill; hover or tap any part or number.

0%0%0%0%0%0%0%0%0%0%0%0%0%0%0%0%0%0%0%0%0%0%0%0% nearfar Ø10Ø8Ø3Ø6 1 · SINGLE RUNNERIn-line, equal runner sizes · unbalancedNear cavities fill first and overpackFar cavities risk short shotsOnly acceptable for very easy parts2 · H-PATTERNNatural balanceSame flow length and sizes to every cavityFills evenly at any process settingMore runner volume and mold space3 · ARTIFICIAL BALANCEIn-line layout, sized runners and gatesCompact, less runner scrapSizes tuned with flow simulationBalance shifts with material and settings 1 2 3 4 5 6 7 8 9 10 11
60%
Source: Topworks Plastic Mold