Best Instructions here:
Filament Cutter 45° von Pomi | Kostenloses STL-Modell herunterladen | Printables.com
Thanks a lot for the Design!
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The author remixed this model.
Remixed the Design from Pomi.
I added some holes for assembly and also drawed it in Fusion360, for those who want to edit the file (f3d files are added).