hypercube Wade's Bowden Remix

i built this to accomplish may things at once, Geared Drive, Bowden, and filament runout sensor. after much trial and error i finally came up with this. uses standard optical endstop (grafted in http://www.thingiverse.com/thing:1646220)and the hobbed bolt kit i found on ebay ( https://www.ebay.com/itm/273770574343?ul_noapp=true ). tube input with m5 thread (comes with hobbed bolt kit), tube output is for M10 tube fitting. inside the body i did my best to design it for simple reliable filament swap so tubing on output side will allow 4mm tubing up into the body after some post print cleanup, same for the filament inlet side. i used a drill pit to clear the bores so filament fits easily. the optical sensor may need shiming to get proper alignment (its hit and miss depending on the sensor) also i designed a preload style main gear to keep things quiet (currently printing it so no prototype yet) but its 2 piece and uses bed leveling springs to load tension install springs, rotate till ali