MMU2S - when loading a filament, sometimes other filament catches the gears and moves forward a bit leaving a possibility of jamming the selector  

MMU2S - when loading a filament, sometimes other filament catches the gears and moves forward a bit leaving a possibility of jamming the selector

I've had my MMU2S (two of them), for a while.  I do get good prints for the most part, making a lot of the upgrades people generally do, including bigger ID tubes.  Now, because they have so much less friction, I generally don't have much problems loading.  Additionally, I do have a buffer so I don't have any of those types of issues either (I don't think).  

My issue is that I think that sometimes, all the filament barely touches the gears, so if one filament is loading, whatever catches could potentially advance anywhere from 4 to 15 mm.  So let's say I'm loading filament 1.  While filament 1 loads, filament 3 catches and advances a tiny bit.  When filament 1 retracts, filament 3 does not retract, perhaps because there's more backpressure than pull pressure.  So when the filament changer starts moving, anywhere from going to filament 3-5 it'll jam up, because that little bit of filament is sticking out.  Honestly, this has been the biggest reason I've had any jams.  I don't usually have any other major issues besides maybe filament that needs drying and snaps, or a filament that's so curved that it misses the filament selector altogether. 

Has anyone encountered this?  Does anyone have a solve?  I feel like if there was a tiny bit more friction in the tubes that would solve it, or if the filament hovered above the gear like half a millimeter more, that would also solve it.  

Thanks in advance!

Bobby