A while back I was doing some work on my extruder trying to clear up a filament jam and repair the filament sensor, and in the process I somehow lost one of the internal parts to the 4-tube bowden inlet. Inside the inlet part labeled “AMS” there are several parts that help guide filament into the extruder. On my A1 Mini I am not using an AMS and only have a single bowden tube.

Not wanting to spend $6 and wait several days to order a new AMS hub from Bambu, I made this. It allows for a standard M3x10 PTFE connector to feed directly into the extruder. I recommend the black connectors if you have them since they let the PTFE tube pass through all the way and allows the tube to mate up directly with the outlet port on the opposite end. If you only have blue or white connectors, the interior of this part is conical so that any filament inserted is funneled to the outlet side. Printed in .16 layer height or lower it's buttery smooth. Not sure about larger layer heights. The part connects to the extruder assembly using the stock setup and retains a small degree of play just as the regional AMS lite hub / inlet did.