So I’m having an odd issue with my X2S. I have two AMS 2 Pro units connected to it through a filament track switch. I haven’t been printing anything complicated…just some two colour labels for my filament dry boxes. First two came out perfectly.
Third one I tried to print, the filament being sent to the auxiliary nozzle would stop halfway between the filament buffer and the extruder, and then retract…tried a few times, and then would just throw an error. Tried a different slot in the AMS…same issue.
Double checked every PTFE tube from the AMS to the printhead…all clear. No filament loaded in the nozzle at all.
Filament would pass through the track switch and the filament buffer without issue, and then just stop about half way through the tube from the filament buffer to the back of the printer itself. Didn’t matter which nozzle I tried loading it into.
On a whim, I bypassed the track switch and it started working normally.
It would be really helpful to see your actual setup.
I have two thoughts about your issue - you either have too much feed resistance, or your PTFE tubes between the FTS and the buffer are too long (limit is 115mm).
Are you using the stock FTS mount and location?
Are you using the PTFE guides at the back of each AMS unit?
I am using a vertical mount, since the AMS units are on top of the printers (one on the X2D and the other on top of it’s neighbour, a P2S). The PTFE tubes between the FTS and the buffer are 150mm and 160mm respectively, and yeah, I’m using the PTFE guides on the backs of the units.
Printing right now (with the FTS bypassed), but as soon as it’s finished I’ll try and post a pic.
The FTS wiki is pretty clear that the max length is 115, I doubt it’s for resistance purposes, so it’s potentially expecting to see a buffer signal at a certain point after filament goes through the FTS.
That would make sense, but then you’d think it would’ve never worked. And it’s been working like this for months, until last night. And the filament goes through both the FTS and the buffer every time. It stops between the buffer and the back of the printer where the external PTFE tubes feed into the rear panel.