Edit: added v5 file with bigger tolerance between rails and some cosmetic triangles

Quick and cheap adjustable router flattening jig for my Makita rt701c to use on end-grain cutting boards and small projects. Proof of concept shown in pictures, I still need to make a table with fences as well as a longer bottom plate for the router to prevent tipping.

The width of the router base is 89mm, which may or may not match the base on other brands.

Uses one 4ft length of 1/8" X 3/4" sharp corner aluminum extrusion cut in half to yield two 2ft lengths. (tip, rubbing alcohol in a spray bottle is an excellent cutting fluid for aluminum)

This is my first time designing with 3d printed threads, so they are rough and fairly tight which does help for their use-case, but you don't need to crank them down onto the extrusion very hard to have enough clamping force to hold them in place.

Printed in PLA at 0.20mm layer height with 4 walls, 15% infill, no supports.

Print 4 of the screws and two of the brackets, slide aluminum into slots and screw down the clamping knobs with the bottom ledges against the outside of your side fences. Coating the surface that the router sides on with a dry lubricant helps it move smoothly.