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The STL files i've uploaded need four M3 screws, with a thread lenght of 10 mm or more. If you want, you can customize this design with Customizer and use another type of screws (just add ~0.3 mm to the diameter of the screw thread, to compensate for hole shrinkage during the print).

I'm creating my own 3D printer too, something similar to a Mendel90, but I haven't even finished the design of the extruder :(