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Materials
Watch the model for temperature issues. Most of the time too cold causes extruder problems or
separation of layers. Too hot (or not enough cooling with fan) is causing warping at overhangs or the
material will degrade in the nozzle which gives a nozzle block after a while.
Start printing with a low speed and slowly rise the speed. Never try to run before you can walk!
Also remember that every material has its own properties like contraction after cooldown.
This means that the dimensional accuracy will be different for every material.