Ender 3 Max Neo - Bottom Filament Roller Guide

The bracket is a remix of the roller guide by holspeed. All the other parts (spacer, rings) come from holspeed's design. On the Ender 3 Max Neo, the bracket holding the extruder & filament sensor is different than other Ender 3 models. The holspeed part does not fit due to the change in the bracket. Since I have a cable chain on my X axis, holes on the factory bracket that other guide designs utilize were out of the question. So I decided to design my own. I'm a rookie at 3D modeling so please forgive my lack of chamfers and nice radii - I just wanted a functional part!

This bracket uses the 4 standoffs for the filament runout sensor as a mounting point, plus a hole on the factory bracket. The bracket is designed to be an exact fit with the thickness of the filament standoffs so that the filament sensor sits snug on the bracket plate.

You will need the following hardware:

• 1 EA of M3x12mm bolt (could probably use 8mm length, I used 10)
• 1 EA of M3 nut
• 1 EA of 608 bearing
• 1 EA of M4x16mm holt

Print the following:

• 1 EA of the bracket
• 2 EA of the spacer
• 1 EA of the ring (try ring.stl first, then ring-sm.stl if it doesn't fit)

Assembly:
You will need to assemble the 608 bearing, spacers and ring - follow holspeed's instructions. Then put the bearing guide into the bracket utilizing the M4x16mm bolt.

Next you will need to remove the bolts holding down the filament sensor. Slide the bracket overtop the standoffs and replace the filament sensor. Next, use the M3x12mm bolt and nut to secure the bracket to the plate.

Happy printing!