I loved the design by BC Designs https://makerworld.com/en/u/1589689919
Just needed it to cut filament already in the extruder on my other printers so I put a slot in the side. I have also added a sacrificial support for the screws which you can remove with a drill bit easily. Please see the original post for all the hardware needed.
****WARNING****
This does require supports for the slot AND I can't stress enough that you could stab yourself trying to remove them. I had a couple of close calls and some clenching of the buttocks but got through it unscathed…..lol