I didn't want my lower firmament guide to stick out of the back of the machine so much so I threw together this quick one based on the dovetailed endcaps. Printed Fine for me with the default Print-O-Matic settings on my T-O-M.

This should fit 3 and 1.75 mm filament - although I have not tested with 3 mm filament it's designed with a 5 mm "tunnel"

At some point I'll modify the other fragile ones on the machine.

Print.

Remove old end-cap and replace with this one.

I reused the existing hardware but some shorter screws could be used if desired.