In kickstarter, ther is the sentinel projact, describing a filament detector.
Sentinel
The project claims compatibility with Repetier firmware, but does not show solutions yet.
Modification of the code, using free endstops or other pins will be the clue.
Has anyone done this already? I have some endstops free :-)
Thomas
www.3daybreaker.blogspot.com
Orca V4.4 rebuild to Ramps with Mk8 and E3D, as well as a Rostock Delta Mini and an OLO in backorder :-)