Geeetech

Hello, if you want to upgrade a20 to a20t, you need to replace the motherboard and then change the firmware to a20t mode. Then you need to replace a 3-in-1 hot end. You also need to purchase two additional extruders, the above upgrade costs may also reach the price of a20t. You can check the relevan...

Hello, by observing your video and pictures, your extruder should have a problem. The link below introduces the cause of the failure and repair methods in great detail. Please refer to the following methods to try to solve the problem.
viewtopic.php?f=19&t=17097

Hello,it can be upgraded, but you need to add an extruder, replace the motherboard, etc. A series of steps, if you are not familiar with it, it is recommended to buy A20t directly.

Ciao, per prima cosa imposti manualmente la temperatura target con la macchina sullo schermo per vedere se può essere raggiunta.

Hello, please check whether the voltage on the motherboard is normal, there may be a problem with the motherboard.
viewtopic.php?f=18&t=18061
If possible, please provide pictures to illustrate the situation.

Hello, it is not recommended that you change the firmware settings yourself. You can directly download the already set firmware. Such as the link below.
viewtopic.php?f=20&t=17046

Hello, if you can't use the LCD screen to control, you can connect the computer with a USB cable, and use the slicing software, such as repeter-host, to extrude 100mm.

Hello, if you are not familiar with DIY3d printers, you can directly try A20 or A30 series printers.

Hallo, bitte versuchen Sie 10mm oder 100mm zu extrudieren. Oder vielleicht ist Ihre Extruderschraube zu fest, bitte versuchen Sie, die Schraubenfeder zu lösen.
Wenn Sie es immer noch nicht lösen können, versuchen Sie, das heiße Ende mit einem Filament zu reinigen, das möglicherweise blockiert ist.

Hello, please check whether the connection between the motherboard and each axis is correct. Maybe you connected the wrong axis.