Material flow determines the output of material. By default Cura will be set for filament of 2.85mm. If in real life you use f.e. material thats 2.9mm you will be overextruding.
1. What Material PLA or ABS or other?
2. What Printing Temp and Speed?
3. Show some Picture that we can analyse the Problem better.
4. Most Filaments work at 100% Flow some needs to be adjusted
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