Filament roll guide - stopper

thingiverse

This prevents filament spools from unrolling filament by keeping them tightly secured in place. To do this, press slightly against the roll and tighten the nut to ensure a firm hold. The P3Steel machine can be directly fitted with these modifications, provided that your roll is positioned on top of the machine. Two of these custom holders were created, but it's likely that only one would suffice for most users. If additional length is required, simply scale up the design accordingly.