Moldex3D Empowers K-Rain to Break Through Cooling Bottlenecks

Moldex3D Empowers K-Rain to Break Through Cooling Bottlenecks: 20% Cycle Time Reduction via Conformal Cooling Integration

Hsinchu, Taiwan — May 27, 2026 — CoreTech System Co., Ltd. (Moldex3D) is proud to showcase a successful collaboration with K-Rain Manufacturing, a leading Florida-based irrigation manufacturer. By leveraging Moldex3D’s high-precision simulation technology and Xact Metal’s 3D printing capabilities, K-Rain successfully optimized its sprinkler-head tooling, achieving a 20% reduction in cycle time and eliminating surface sink marks.

The Challenge: Surpassing the Limits of Conventional Cooling

K-Rain initially struggled with excessive cooling times and aesthetic issues in its sprinkler-head production. Traditional cooling methods—including stainless steel lines with cooling rods and thermal pins—failed to provide the thermal uniformity required for high-volume manufacturing. This resulted in a cycle time of 52 seconds and persistent sink marks on the part surface due to uneven heat dissipation.

To find a solution, K-Rain partnered with Zero Tolerance LLC, a specialist in mold design and manufacturing. Zero Tolerance engaged Reaction Plastics Solutions (RPS) for their deep expertise in Moldex3D simulation to validate the effectiveness of a 3D-printed conformal cooling strategy.

The inserts as printed by Zero Tolerance using Uddeholm Corrax material and Xact metal laser sintering.
(Photo Credit: Zero Tolerance)

The Role of Moldex3D: Precision Design and Flow Optimization

Richard Evans, owner of RPS, highlighted that while 3D printing offers near-infinite freedom in channel design, it also risks creating channels with poor flow if not engineered correctly. Using Moldex3D, Evans was able to simulate and ensure that the conformal channels achieved a high Reynolds number for turbulent flow—essential for efficient heat transfer—while maintaining manageable water pressure requirements.

Moldex3D Simulation Results (Later Proven in Production) Showed:

• Significant Temperature Drop: Maximum mold temperature was reduced from 128°F to 96°F.
• Total Cycle Optimization: Combined fill, pack, and cooling time dropped from 26.39 seconds to 24.05 seconds.

Proven Results: A Leap in Quality and Productivity

The new inserts, printed by Zero Tolerance using Xact Metal’s laser powder-bed fusion system and Uddeholm Corrax stainless tool steel, delivered immediate performance gains upon integration:

• Cycle Time Reduction: Overall cycle time was cut from 52 seconds to 41 seconds (a total savings of 11 seconds, with 8 seconds directly attributed to the conformal cooling circuit).
• Parameter Optimization: Cooling time was reduced from 20 seconds to 14 seconds, and mold-open time was shortened by over 2.6 seconds.
• Defect Elimination: The precise thermal management of the conformal channels completely eliminated sink marks from the part surface.

Driving the Future of Tooling Optimization

“Our customer, K-Rain, was looking for tooling optimization for better quality and faster cycle times,” said Steve Michon, President of Zero Tolerance. The synergy between Moldex3D’s digital twin technology and metal additive manufacturing has allowed K-Rain to transform its production efficiency and part aesthetics.

Moldex3D continues to lead the way in conformal cooling analysis, helping global manufacturers reduce trial-and-error costs and achieve sustainable, high-efficiency production through scientific simulation.