B2D - a few parts modified

I really love the original design of the B2D feeder. It's compact and excellently designed. There were a few improvements I made on the parts that were derived from my workflow that may be useful to others.

For 1.75mm files:
1) Nut and bolt were changed to accommodate a #10 nut with a button head screw
2) Bearing mount and spring housing were modified to have a larger finger pad to more easily squeeze the spring to manually load/unload the length of the bowden tube
3) Two alternative filament "out" parts are uploaded for either a 6mm tube collet/retaining clip, or a 4mm tube push connect fitting that comes with the E3D V6 hot end kit, or also most of the clones available on Amazon (this requires an additional M6 nut)

For 3.00mm files:
4) The in/out and bearing mount files were modified so that the filament run has a smooth curvature with a diameter of ~25cm. I had a lot of trouble using the original files on my Ultimaker Go with the last 25% of a PLA spool because the feeder