The most common reason why you need to change the heat block on your 3d printer is a stripped nozzle thread.
If you change nozzles pretty regularly like me then, eventually, you are going to wear out the threads in the aluminium heat blocks that are supplied with most of the lower budget 3d printers.
The new parts are not expensive and replacing your heat block can be done quickly and safely if you follow these steps. If you'd rather change the whole hotend then I have a video linked here and in the description. Changing the whole hotend is slightly easier but costs a little more. If you want to just change the heatblock then you're in the right place.

Other videos referenced:
Hotend Change [ Ссылка ]
Hotend Cleaning [ Ссылка ]
Replacing Bowden Tube [ Ссылка ]

Affiliate links (If you purchase something after clicking any of the below links I may earn a small commission at no cost to you. This is a great way to support the channel)

Heat Block (Ender 3)
[ Ссылка ]

Nozzle Spanner (6mm Standard Ender 3 v2)
US [ Ссылка ]
UK [ Ссылка ]

Pneumatic Fitting for Bowden Tube
US [ Ссылка ]
UK [ Ссылка ]

Capricorn Tubing
US [ Ссылка ]
UK [ Ссылка ]

Replacement Nozzles
US [ Ссылка ]
UK [ Ссылка ]

Silicon Sock
US [ Ссылка ]
UK [ Ссылка ]

Adjustable Spanner
US [ Ссылка ]
UK [ Ссылка ]

Brass wire brush
US [ Ссылка ]
UK [ Ссылка ]

Rigger (leather) gloves
US [ Ссылка ]
UK [ Ссылка ]

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