My filament is stretching, and the gears are having trouble to push them.
This happened with multiple colors from PLA and PETG. I tried to tight and loose the gear spring, but to no avail. I tried to print in higher temps, but the problem persist.
Basically, when a print start I need to pause it, and push the filament while I extrude, or the print doesn’t work.
Anyone knows why this happens?
Can the spool this is coming from spin smoothly without resistance wherever it’s at?
I believe so. The spool is in stock holder the that comes with the A1. At least, I don’t see any drag when pushing the fillament.
Ok, so that shouldn’t be an issue, what about the extruder gears? Does the spinning extruder wheel on the printhead seem to visably/audibly slip or anything while printing or is it a smooth rotation while it’s trying to print?
Here’s what slipping looks like
You can also test by taking the hotend out and manually extruding and retracting filament and watching it, as shown here:
During the machine start (when it is purging the filament) I can hear some clicking, yes. But if disassemble everything, it doesn’t skip. At least I couldn’t replicate this without starting a print.
What I would do is first manually test extrusion/retraction, then open it up and watch the extruder gears to see when/how it fails. If you’ve opened up the extruder and everything works without issue while open, it may be something pinching the filament that shouldn’t be once it’s put back together.
Check out this, particularly starting at the “Hotend Clogged” section, as that and directly below that seem to be most relevant to what you’re experiencing:
Also, make sure your nozzle buckle is on securely, typically I wouldn’t expect that to be the cause of this, but while you’re in there it takes 2 seconds to press on it to check so 
I’ve cleaned the nozzle, like the link you sent. I’ll let you know if something changes.
Do you have a spare nozzle to swap out?
It is always useful to have at leat one spare of the same size.
If not, get a 0.4 hardened steel nozzle which will give you access to other materials as a side-benefit.
Ideally, you should have spares of the important stuff so yo are not out of commission.
I am not saying 3D printers are like drugs nd we are addicts, but, it sometimes feels that way.
