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Mais que peut-il bien se passer dans ces 3 mm ?

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Bonjour à tous, 


Je débute dans l'impression et je suis confronté à un problème curieux que je ne m'explique pas. 

Ma première couche adhère parfaitement, tout se passe bien mais les 2 ou 3 premiers millimètres ont systématiquement une finition déplorable. 

Si l'un de vous à une idée, je lui en serai très reconnaissant car là, je cale. 



Voici quelques exemples


Le noir est du PLA+ 1.75mm Sunlu et le Blanc un PLA classique d'entrée de gamme 1.75mm mais la différence n'est pas flagrante. Je chauffe le PLA+ à 215°C


Je mets une capture du profil Cura utilisé : 



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