18650 Battery Spacer Grid | Octagonal (8-28 Cells)

This is the "Powerhouse" edition of my octagonal battery holder system. These 4-row wide grids are designed specifically for large-scale energy storage projects, such as home powerwalls, solar accumulators, or high-performance EV battery packs.

Why use the 4-wide series?

• Assembly Speed: Instead of gluing dozens of smaller holders, use these large blocks to rapidly assemble huge battery arrays.
• Structural Integrity: A 4-wide block creates an incredibly solid core, keeping cells perfectly aligned under the weight of a large pack.
• Octagonal Channels: In a dense 4-deep pack, airflow and wire routing are critical. The octagonal design ensures there is a gap between every single cell to prevent heat buildup and allow for BMS sense wires to pass through.

The Set Includes (Grid Sizes):

• 4x2
• 4x3
• 4x4
• 4x5
• 4x6
• 4x7

Printing Instructions:

• Material: ABS, ASA, or PETG are mandatory. High-discharge packs generate heat that will deform PLA.
• Fit: Designed for a secure friction fit.
• Wall Count: Use at least 3 perimeters for maximum stiffness.

Design by Mateusz Tokarz on MakerWorld (license: BY).