I already have other addons, how do I connect the Purifier to use? – Snapmaker

There are three scenarios as follows:

Scenario 1: You have purchased the Enclosure and the Purifier but have not purchased the CAN Hub.
Method: Connect the Enclosure to the Add-on 3 port of the controller, and then connect the Purifier to the Enclosure.

Scenario 2: You have purchased the Enclosure, the Emergency Stop Button and the Purifier but have not purchased the CAN Hub.
Method: In this scenario, you cannot use the Emergency Stop Button and the Purifier simultaneously. Connect the Enclosure to the Add-on 3 port of the controller, and then connect the Purifier or the Emergency Stop Button to the Enclosure.

Scenario 3: You have purchased the Enclosure, the Emergency Stop Button, the Purifier, and the CAN Hub.
Method: Connect the Enclosure to the Add-on 3 port of the controller, connect the CAN Hub to the Enclosure, and then connect the Purifier and Emergency Stop Button to the CAN Hub.