If you want to print multi-color, multi-material Model or you want to avoid support material you schould better split your Stl-Model into several Pieces. You can do this with Meshmixer ( it is for free).. You can use also this powerfull tool to create alignment Pins. That helps to fit the Parts together easely. In this tutorial Video i schow how to do it: Split your STL-File and use alingment Pins: https://youtu.be/1r0MkZ288lY
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