ProStruder filament guides

I've had ProStruders with Prometheus system for a while now and they work very well. However, sometimes when there's a filament jam or wrong feed sequence is triggered, the powerful steppers can push filament with such force that it 'spills' from the sides as the filament path is somewhat open. Also PTFE tubes aren't that rigid, making this problem bit worse.

So designed these filament guide parts. They replace following parts from the original ProStruder:
- 4x M3 Washers
- 3 Acrylic Tube