Issue
The ACE Pro makes a clicking sound, and filament is not extruding smoothly from the hot end when you select EXTRUDE in the control screen. Article applies to Kobra S1 Combo (TL5210) and Kobra 3 Combo (TL5200) printers.
Cause
The clicking sound is the pusher mechanism skipping, as there is too much filament resistance for it to overcome.
This can happen when the filament path from the ACE Pro to the hot-end has a blockage somewhere (broken filament in the PTFE tubes/filament hub/filament sensor box/hot end extruder), or there is a blockage in the hot-end itself.
This can also happen when the filament has routed incorrectly inside the ACE Pro itself. This can occur when the filament is excessively bent or curved when it is first inserted.
How to Fix
You will need check for the following:
Kinked / dirty PTFE tubes
High resistance in the tube may prevent feeding, make sure it curves smoothly and is clean inside.
Blocked filament hub
Unscrew it from the external filament sensor, detach tubes, and check for broken filament inside.
Blocked external filament sensor
Unscrew it, detach hub, and check for broken filament inside.
Blocked extruder
Release your hot end and command EXTRUDE to clear blockage. Dismantle & clean if no better.
Blocked hot end
Manually heat to 230deg and push a piece of filament through. If blocked, clear with needle or replace.
Note: do not attempt to Home the printer without the fan cover clipped on the hot-end. It presses the cover against a limit switch in the left-front when Homing, and will make a loud racket if the cover doesn't hit the switch.
Be careful with the extruder when separating it into two halves, as there is a filament sensor with a small cam and spring inside it (red area below), and these can easily be lost if you are not ready to catch them.
.
If the filament path from the ACE Pro to the hot end is clear and you can manually push a piece of filament through to the hot end via the filament hub, you will need to dismantle the ACE Pro to check if the filament has routed inside itself. You may also need to check that the buffer is feeding correctly.
Make sure the buffer tubes that push out from the back are able to move smoothly and retract all the way back into the ACE Pro. If they stick, or don't retract all the way, remove the cover over the tubes, then remove the screws holding the tube halves together, and clean the part that has the spring. You can lube this spring with grease. Be sure to reinstall the tubes the right way up - the magnet in the tube needs to be facing upward, not facing the cover.
See below for articles on disassembling the ACE Pro and checking the buffer.
https://wiki.anycubic.com/en/fdm-3d-printer/kobra-s1/ace-pro-blocking
https://wiki.anycubic.com/en/fdm-3d-printer/kobra-3-combo/buffer-mechanism-maintenance
https://wiki.anycubic.com/en/fdm-3d-printer/kobra-3-combo/ace-pro-motor-replacement-guide\
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