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Why my small cuboids are not perfectly aligned with the big one?

include <BOSL2/constants.scad>
include <BOSL2/std.scad>
use <BOSL2/shapes.scad>

diff("remove")
cuboid([1, 0.5, 0.2], anchor=BOTTOM){
    attach(RIGHT) cuboid([0.2, 0.4, 0.1], anchor=TOP, $tags="remove");
    attach(LEFT) cuboid([0.2, 0.4, 0.1], anchor=TOP, $tags="remove");
}

enter image description here

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from Revar Desmera:

The attach() module by default overlaps the attached with the parent by a slight amount (0.01). You can do attach(RIGHT,overlap=0) for an exact alignment. The overlap is so that CGAL correctly can union shapes.

and the attach() documentation :

Attached objects will be overlapped into the parent object by a little bit, as specified by the default $overlap value (0.01 by default), or by the overriding overlap= argument. This is to prevent OpenSCAD from making non-manifold objects. You can also define $overlap= as an argument in a parent module to set the default for all attachments to it.

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