# Why my 3D printing module is clogged?

### 1. The vertical side fan isn't working. 

<div align="left"><img src="/files/-MCf7lL3sRfK0EMJVK1J" alt=""></div>

The side fan is designed to work and cool off the heatsink once it's power on. If not, it will cause the nozzle clog problem.&#x20;

If you meet this problem, please email <support@rotrics.com> to describe the problem and we will send you a replacement fan part as soon as possible.&#x20;

Or you can order a fan in the local store and replace it. The spec of the fan is:&#x20;

* Size: 30x30x10 mm
* Power: 12V 0.1A


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