SV06 Plus Filament Runout Sensor with bowden fittings

prusaprinters

I have an SV06+ that occasionally needs to be fed from a dry box via reverse bowden tube, no solutions seemed to exist for this exact combo. I saw plenty of models that friction fit bowden tubing into a housing to make it a smoother run but not with any accommodation for a fitting. This led me to strip the stock sensor housing apart and get to work, I rebuilt the stock housing first and just tacked some fitting bosses on. it was “functional” but not really a good solution. I then created almost what you see here but much more “rounded” I liked it but it really didn't fit the aesthetic of the SV06 line. So I reworked the whole housing to be much more angular and ultimately ended up here. I added a backing to the filament run with a very slight channel to help guide the filament through the sensor path and into the outlet fitting without interfering with the actual operation.After testing this setup for a few weeks and many many hours of printing I have had no false triggers or snags. The filament feeds through remarkably well both from the dry box and from the stock spool holder, especially with the included swing arm replacement which moves the whole runout sensor out 45mm to set it in the middle of most spools that I use and tested with. When used in conjunction with https://www.printables.com/model/462049-sovol-sv06-plus-bowden-tube-mount you end up being able to keep the filament path really well constrained between the spool and the extruder which helps keep feisty filaments in their place, it was just an added benefit I was not expecting when setting this whole thing up.This project requires 2 PC4-M6 fittings and whatever 4mm OD bowden tubing you like to use, all other stock hardware is reused for both the sensor housing and the swing arm, just remove the bolts+spacers (only for the arm if used) and install them on the new parts. The openings for the fittings are easier to run an M6 tap through to cut threads but I have successfully cut them using a fitting just fine multiple times while creating all of the revisions prior to release. I have also used both PLA and PETG for the housing and haven't seen any issues or wear with either one but I suspect the PETG will last longer overall.I designed the whole thing around 0.2mm Layer heights so that is recommended but feel free to experiment that is part of what this whole thing is about.I am including the Solidworks files so if you would like to modify it to your hearts content and help upgrade the whole system feel free to. If you do not have the ability or desire to make modifications and see something in testing that you would like addressed send me a message or leave a comment and I will try to keep this updated and annotated with community fixes.  If you read all of this you are awesome and thank you for your time, I hope this can help some people in the same boat I was in.