Take a look at the shirtboard and level it out as much as you can and check the print head height by adjusting the gap, tighten the screws on the back of the viper too if needed, use uni directional printing mode and choke the underbase at 5. Try this and let me know what happens
i think that there is not enough tension on the belt from the carriage of the printer, or the drive gear is a little bit lose, or the screwsof the motor from the drive are lose.
Maybe is the transparant strip to lose.
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