Edit: I added a cover to print which allows the use of the original screws for mounting to the machine.

Ok I have not been too happy with the way my filament sensor/filament guide were working so I made this thing. An all in one solution to a problem you might not know you have (yet).

I took inspiration from a few of the other feeders and remixes out there and put them all together as one. Check out OneBadMarine for his filament roller guide https://www.thingiverse.com/thing:3148615
Also liked the thing from clockworkusa Filament Guide - Roller - Holder https://www.thingiverse.com/thing:3428177

My design still allows the use of the filament sensor but eliminates the problem of not being able to feed flexible filaments or any filament for that matter through the stock sensor housing.
You will require a few parts and a drill and bits to assemble this but it is quite straight forward.

Gather parts and tools needed. You will require

• 3 m3 nuts
• 3 m3x12mm screws
• 2 m3x4mm stock sensor screws. Longer screws are recommended though (6-12mm)
• We will reuse the stock screws to mount to the machine with the printed cover.
• 40mm piece of bowden tube (4mm outside diameter)
• 22x7 mm x 8mm bore bearing (not needed if you print sheeve)
• A drill and 7/32" or 5.5 mm drill bit.

1. First thing you will need is to download and print the CR10SPRO infeed wheel and the Pin2 from OneBadMarine's page. He has also provided a file for those that do not have the required bearing 22x7x8mm bore (skate board bearing)
   https://www.thingiverse.com/thing:3148615

Next print the 3 files included here. Once printed you can insert 3 m3 nuts in the captured pockets on the feeder block. Go ahead and install the wheel/bearing and pin if you like now.

Next Install a 40mm piece of bowden tube in the feeder block.

Screw the clamp to the top of the feeder block and bowden tube. DO NOT OVERTIGHTEN. This part does not have to be super tight, just snug enough to hold the bowden tube in place. There was a .75mm gap left between the clamp and block at design stage to accommodate different tube thicknesses.

Once snugly clamped you can trim the excess bowden tube flush with the end of the feeder block.

Take your drill with a 7/32" or 5.5mm drill bit and drill carefully from the bottom of the feeder block up through the side of the bowden tube.
TIP: Put a piece of scrap filament inside the bowden tube before drilling for a cleaner hole.

Mount the factory filament sensor to the feeder block. You can tap these holes before hand to make it easier.
Next mount the full assembly to the machine using the factory mounting screws anf the cover. Feed in filament and test to make sure the filament sensor triggers (clicks) when filament is present.

If you need to adjust the sensor so it triggers when filament is present OR if it signals filament is present when it is not, you can gently bend the arm of the sensor. This step was not necessary with my stock sensor.