Optical Filament Sensor (OFS) and (IOFS)

thingiverse

USE IT WITH CAUTION AND AT YOUR OWN RISK. Hello all: I acquired an optical end stop from AliExpress a few months ago and needed a custom filament run-out sensor case for it. I couldn't find something that fit this end stop, so I designed this case for it. It also features PTFE tubing holes to help mount this thing to your extruder and guide the filament through it. The thing has a tolerance of 0.5mm with exceptions for the PTFE tubing holes, which have a tighter 0.2mm tolerance to ensure a snug fit. I hope you like it. Update: I added a new design called IOFS that solves the issue of bent filaments (small bends) not being detected by the sensor, addressing this problem. Additionally, I've noticed that some filaments won't be detected with this optical sensor, such as: severely bent hard filament after improper rewinding due to inconsistent filament diameter, especially when the extruder pulls the filament out from the spool. However, if you have good-quality filament, it will work fine, at least in my case. There are also other filaments like generic TPU (95A) that won't trigger the sensor with or without this mount, even if you try manually. This is due to material properties that affect light reflection. Similarly, hard filaments and certain others have the same problem. As for transparent filament, I'm still unsure about it.