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Hi Fabrice,
We have received your problems feedback.
To solve your problems better, Please attach some
pictures or videos of the product to illustrate the issues ,you can contact our technical support mailbox:support@geeetech.com or create a ticket on our official website, the ticket link is here:https://www.geeetech.com/index.php?main_page=ticket .
Our tech support will give you professional printing advice and methods.
If you need any help,you can also contact me at this email: myorder@geeetech.com.
Have a nice day.