Creality CR-10S Pro V2 Reverse Bowden Filament Guide

https://youtu.be/TMVGrmwluwY

I designed this piece to hold a PTFE tube as a reverse bowden filament guide for my Creality CR-10S Pro V2. I have a filament dryer next to the machine and want to have the PTFE guide the filament out of the dryer and into the runout sensor. With a decent piece of PTFE, it will have enough reach to guide the filament throughout the height of the Z axis.

There are 2 styles. The first requires you to remove the 4 screws holding the runout sensor and slide the piece onto the runout sensor and reassemble. The second (named "with Cutout") does not require removal of the runout sensor. It has a notch in the back to slide between the runout sensor and the lead screw.

I designed the pieces to print without supports. That is why the front of the guide is more than just a cylinder. By extending the shape downward, there's no need for supports.

I intentionally opened what I call a "window" so I can see the PTFE tube as it hits against the piece against the runout sensor. Thus, I am able to see the tube move backward during retractions. I experimented with a firm attachment of the tube via a pneumatic connector, however, I decided I didn't want the retraction to have to push filament backwards through the PTFE tube. So, that's why the tube is able to move back freely so there's no pressure when retractions occur.

There is one significant downside to my approach. If you have quick de-retraction speed, you may hear the tube "tap" as it moves back toward the runout sensor. I don't mind the tapping, but I mention it in case it would be of concern for you.

I have named them v1.0 as I believe this is now a reliable design. However, I anticipate some suggestions and feedback and may later create updated versions. So, please let me know what you think.

~SDG