Layers bond too heavily when the material is overheated. Proper platform calibration is very important. Facts Ambient temperature should be kept below 28☌. If ambient temperature in the room exceeds 28☌, the extruded material does not have enough time to cool down. The issue is usually caused by material’s overheating. Here’s why it happens and how to deal with it. But sometimes the raft and supports become so firmly attached to the model that it’s almost impossible to split them up. In a single-extrusion 3D printer, the raft and support structures need to be manually removed from the model once the 3D printing is done. More intricate models also need additional support structures to keep overhangs from falling. Most FDM 3D printers can print models on the raft, a flat structure made with the first few layers of filament to increase adhesion and dimensional accuracy.
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