@t3p3tony I understand this is working as designed... I just think it is an arbitrary, wrong, limitation.

I am converting my printer from Duet 2 Wifi to a Duet 3 Mini 5+ with a Toolboard v1.1. I have everything working except my filament sensor.
In my config.g, I have :

M591 P2 C"0.io5" D0 S1

I have a reverse Bowden with a direct drive extruder. So I want the filament on the reverse Bowden, connected to the Duet 3 Mini 5+, not the Toolboard.

However, when I run the M591, I get:

Filament monitor port must be on same board as extruder driver

I can't be the only one who has this type of setup. Are there any work arounds?

Thanks in advance.