You can easily build this router sled that rides on linear rail guides, with bearings, for a lot less than buying one.

When lacking space or budget for big tools, you can build a router sled to flatten almost any piece of wood. Follow these steps to do this DIY project.

The new version comes with 2 additional risers to increase the depth of material that can be flattened, up to 2" with the included pieces, but the design allows you to use standard 1/4 -20 screws ...

HOW TO BUILD A ROUTER SLED / SLAB FLATTENING MILL ✅️ TOOLS AND SUPPLIES IN THIS VIDEO: - Freud 1 1/4" bit - Amana surfacing ...