Banggood Dear Customer, Thank you for your feedback and we are really sorry for all the inconvenienced caused during your shopping and looking forward to solve your problem. We have already received your feedback for the order. We would like to try our best to provide you the best solutions. For this reason, if your questions have not been solved yet, please do not hesitate to contact us via the link: https://www.banggood.com/es/Contact-Us_hi111 and provide more details about your question so that we can confirm the case as soon as possible and solve it efficiently. And we will reply and offer you the best solutions after receiving your email within 24-48 hours. Best regards, Banggood Team

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Malato HiCosta,
I have has the same issue as you. How I have managed to resolve this is to manually spinning each roller randomly a little bit before use. It seems the wheels develop some compression flat spots from when the unit is not in regular use.
Try this and manually glide the carriage to feel if it moves smoothly along the channel.
Hope this helps to get your machine up and running as it is trully a fantastic unit.

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