A1 0.2mm nozzle flow calibration just clicks

Bambu Lab A Series General Discussions
1

I’m trying to use a 0.2mm nozzle on my A1.

It’s a BBL hotend and filament extrudes and purges well, however at flow calibration the extruder just clicks.

I turned the temp up to 230 (extrusion still works) but flow calibration just clicks again. It will continue clicking till I turn off the machine. Canceling the print doesn’t seem to make it stop.

Any ideas?

2

Both the printer and Bambu Studio must be set to 0.2 mm.
If the printer thinks a 0.4 mm nozzle is installed, it may attempt to extrude far too much material during calibration, causing the extruder to skip.

3

Thank you for the reply. Both printer and BB studio are set to 0.2mm, (just checked to make sure). Tried printing again: purge worked with 1-2 clicks. Flow calibration worked for two poops, third time it clicks :unamused_face:

4

Tried with a filament that should be easier to print: Sunlu pla+ 2.0 to same result: clicking through flow calibration.

The nozzle is new and BBL brand :downcast_face_with_sweat:

5

A ‘click’ usually indicates that the gear driving the filament is, in effect, skipping. This is because the gear is either no longer gripping the filament properly or is jammed. It doesn’t have to happen all the time; depending on the problem, it might just start randomly at first.

  • First, you’ll need to cut off a good-sized piece of the filament; it’s probably been worn down from gear spinning.
  • Then you’ll need to clean your gear; there’s probably filament dust or even fragments on it.
  • Then please check to see if your filament is even suitable for a 0.2 nozzle.
  • Please also check whether the nozzle is getting hot at all and is seated properly - make sure the locking clip is fully closed. It’s unlikely, but it’s worth checking just in case: Is the 0.2 clogged? Clean the nozzle.

Strongly recommended: remove the front cover and see what’s going on inside:

6

Thank you for the reply.

Yes the extruder clicks because it’s skipping.

The filament isn’t worn down from the extruder gear because it will extrude at purge and poop time. It will also extrude when printing, if i leave flow calibration run out or I cancel it before printing.

The printer is just 120h old so there shouldn’t be a lot of dust in the gears, but I will have a look.

The filament is normal PLA on one hand and PLA+ 2.0 (high speed / low temp) on the other. Both printed perfectly on the P2S with a 0.2mm nozzle. I will see if others have difficulties with them though.

The nozzle should be in place and is heating properly (according to the readings at least), but I will double check the clips..

I still find it weird that it can extrude for purges but not for flow calibration. Materials I have used with a 0.2mm nozzle before. And this being a close to new printer.

I’m staring to suspect a faulty nozzle, or the A1 has less extruder torque than the P2S.

7

When you print something, it only covers a specific range of flow values like speed. During flow calibration, however, a wider range of flow values are used and tested. It’s likely that your extruder or nozzle is having issues in a certain range that don’t occur during normal printing but during flow calibration.

But that’s just my theory.

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