Anycubic i3 Mega - Linear Bearing Mount with M4-CoreHoles Raw

2018-09-14: V3

one may have a problem to screw in the screws, so I added 2 parameters to the scad-file at the very beginning:

// diameter of the core-holes for the M4-screws
CoreDiameter = 3.3;
// diameter of the bevels for the M4-screws
BevelDiameter = 4.5;

so one may play with this 2 values

for better internal handling of the bevels, I changed the measures and position of the generating cones a bit, what produces some "foils" in the view of the scad-file, but it would be rendere