On the Craftbot Flow the filament tube easily slips off Craftbot's metal mounting bracket. Further, the original filament entry is rather tight and edgy, producing inconvenience and additional drag.

My custom Craftbot Flow filament tube holder firmly clamps the filament tube and provides a smooth filament entry. It is an improvement over my earlier design
https://www.thingiverse.com/thing:5353654

The screw is an M3 x 8 mm.

I am using this new holder in conjunction with Waggster's brilliant spool mount
https://www.thingiverse.com/thing:4440926
and my ball bearing spool shaft with adjustable hub
https://www.thingiverse.com/thing:5369605
but it will also be useful when mounted simply on Craftbot Flow's metal enclosure.

As always I include the OpenSCAD source file for you to improve or adapt. In case you want to modify it:

• Download and install OpenSCAD from https://www.openscad.org
• Launch OpenSCAD and open the enclosed OpenSCAD source file (/File/Open).
• Amend the parameters at the top of the file and/or modify the source code.
• Save your changes (/File/Save).
• Render the design (/Design/Render).
• Export the rendered design e.g. as a .stl file (/File/Export/Export as STL).
• Slice and print.

See my other designs at
https://www.thingiverse.com/thinger13/designs