If you’ve been pushing your xTool laser for deep engraving or thick material cutting, you may have heard whispers about the . Here’s what you need to know.

It’s a community-developed hardware mod (often 3D-printed or machined) designed to apply consistent downward pressure on your laser module’s focus mechanism. The goal: eliminate backlash or vertical play in the Z-axis during high-power, multi-pass jobs.

xTool’s diode and CO₂ lasers (e.g., P2, S1, M1 Ultra) are precise, but deep engraving (e.g., 3mm+ into wood or acrylic) can show inconsistent focus. The precompression tool keeps the lens assembly preloaded, maintaining the same focal point pass after pass.

If you’re battling inconsistent Z-axis focus on deep jobs, it’s a clever $10-20 upgrade. If you only cut and engrave at 1-2mm depth, you can skip it.