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LibFile: masks3d.scad

This file defines 3D masks for applying chamfers, roundovers, and teardrop roundovers to straight edges and circular edges in three dimensions.

To use, add the following lines to the beginning of your file:

include <BOSL2/std.scad>

File Contents

  1. Section: Chamfer Masks

  2. Section: Rounding Masks

  3. Section: Teardrop Masking

Section: Chamfer Masks

Module: chamfer_edge_mask()

Synopsis: Creates a shape to chamfer a 90° edge. [Geom]

Topics: Masking, Chamfers, Shapes (3D)

See Also: chamfer_corner_mask(), chamfer_cylinder_mask(), default_tag(), diff()

Usage:

  • chamfer_edge_mask(l|h=|length=|height=, chamfer, [excess]) [ATTACHMENTS];

Description:

Creates a shape that can be used to chamfer a 90° edge. Difference it from the object to be chamfered. The center of the mask object should align exactly with the edge to be chamfered.

Arguments:

By Position What it does
l / h / length / height Length of mask. Default: $edge_length if defined
chamfer Size of chamfer.
excess The extra amount to add to the length of the mask so that it differences away from other shapes cleanly. Default: 0.1
By Name What it does
anchor Translate so anchor point is at origin (0,0,0). See anchor. Default: CENTER
spin Rotate this many degrees around the Z axis after anchor. See spin. Default: 0
orient Vector to rotate top towards, after spin. See orient. Default: UP

Side Effects:

  • Tags the children with "remove" (and hence sets $tag) if no tag is already set.

Example 1:

chamfer\_edge\_mask() Example 1 
include <BOSL2/std.scad>
chamfer_edge_mask(l=50, chamfer=10);



Example 2:

chamfer\_edge\_mask() Example 2 
include <BOSL2/std.scad>
difference() {
    cube(50, anchor=BOTTOM+FRONT);
    #chamfer_edge_mask(l=50, chamfer=10, orient=RIGHT);
}



Example 3: Masking by Attachment

chamfer\_edge\_mask() Example 3 
include <BOSL2/std.scad>
diff()
cube(50, center=true) {
    edge_mask(TOP+RIGHT)
        #chamfer_edge_mask(l=50, chamfer=10);
}



Module: chamfer_corner_mask()

Synopsis: Creates a shape to chamfer a 90° corner. [Geom]

Topics: Masking, Chamfers, Shapes (3D)

See Also: chamfer_cylinder_mask(), chamfer_edge_mask(), default_tag(), diff()

Usage:

  • chamfer_corner_mask(chamfer) [ATTACHMENTS];

Description:

Creates a shape that can be used to chamfer a 90° corner. Difference it from the object to be chamfered. The center of the mask object should align exactly with the corner to be chamfered.

Arguments:

By Position What it does
chamfer Size of chamfer.
By Name What it does
anchor Translate so anchor point is at origin (0,0,0). See anchor. Default: CENTER
spin Rotate this many degrees around the Z axis after anchor. See spin. Default: 0
orient Vector to rotate top towards, after spin. See orient. Default: UP

Side Effects:

  • Tags the children with "remove" (and hence sets $tag) if no tag is already set.

Example 1:

chamfer\_corner\_mask() Example 1 
include <BOSL2/std.scad>
chamfer_corner_mask(chamfer=10);



Example 2:

chamfer\_corner\_mask() Example 2 
include <BOSL2/std.scad>
difference() {
    cuboid(50, chamfer=10, trimcorners=false);
    move(25*[1,-1,1]) #chamfer_corner_mask(chamfer=10);
}



Example 3: Masking by Attachment

chamfer\_corner\_mask() Example 3 
include <BOSL2/std.scad>
diff()
cuboid(100, chamfer=20, trimcorners=false) {
    corner_mask(TOP+FWD+RIGHT)
        chamfer_corner_mask(chamfer=20);
}



Example 4: Anchors

chamfer\_corner\_mask() Example 4 
include <BOSL2/std.scad>
chamfer_corner_mask(chamfer=20)
    show_anchors();



Module: chamfer_cylinder_mask()

Synopsis: Creates a shape to chamfer the end of a cylinder. [Geom]

Topics: Masking, Chamfers, Cylinders

See Also: chamfer_corner_mask(), chamfer_edge_mask(), default_tag(), diff()

Usage:

  • chamfer_cylinder_mask(r|d=, chamfer, [ang], [from_end]) [ATTACHMENTS];

Description:

Create a mask that can be used to bevel/chamfer the end of a cylindrical region. Difference it from the end of the region to be chamfered. The center of the mask object should align exactly with the center of the end of the cylindrical region to be chamfered.

Arguments:

By Position What it does
r Radius of cylinder to chamfer.
chamfer Size of the edge chamfered, inset from edge.
By Name What it does
d Diameter of cylinder to chamfer. Use instead of r.
ang Angle of chamfer in degrees from the horizontal. (Default: 45)
from_end If true, chamfer size is measured from end of cylinder. If false, chamfer is measured outset from the radius of the cylinder. (Default: false)
anchor Translate so anchor point is at origin (0,0,0). See anchor. Default: CENTER
spin Rotate this many degrees around the Z axis after anchor. See spin. Default: 0
orient Vector to rotate top towards, after spin. See orient. Default: UP

Side Effects:

  • Tags the children with "remove" (and hence sets $tag) if no tag is already set.

Example 1:

chamfer\_cylinder\_mask() Example 1 
include <BOSL2/std.scad>
difference() {
    cylinder(r=50, h=100, center=true);
    up(50) #chamfer_cylinder_mask(r=50, chamfer=10);
}



Example 2:

chamfer\_cylinder\_mask() Example 2 
include <BOSL2/std.scad>
difference() {
    cylinder(r=50, h=100, center=true);
    up(50) chamfer_cylinder_mask(r=50, chamfer=10);
}



Example 3: Changing the chamfer angle

chamfer\_cylinder\_mask() Example 3 
include <BOSL2/std.scad>
difference() {
    cylinder(r=50, h=100, center=true);
    up(50) #chamfer_cylinder_mask(r=50, chamfer=10, ang=70);
}



Example 4:

chamfer\_cylinder\_mask() Example 4 
include <BOSL2/std.scad>
difference() {
    cylinder(r=50, h=100, center=true);
    up(50) chamfer_cylinder_mask(r=50, chamfer=10, ang=70);
}



Example 5: Masking by Attachment

chamfer\_cylinder\_mask() Example 5 
include <BOSL2/std.scad>
diff()
cyl(d=100,h=40)
   attach([TOP,BOT])
      tag("remove")chamfer_cylinder_mask(d=100, chamfer=10);



Section: Rounding Masks

Module: rounding_edge_mask()

Synopsis: Creates a shape to round a 90° edge. [Geom]

Topics: Masks, Rounding, Shapes (3D)

See Also: edge_profile(), rounding_corner_mask(), default_tag(), diff()

Usage:

  • rounding_edge_mask(l|h=|length=|height=, r|d=, [ang], [excess=], [rounding=|chamfer=], ) [ATTACHMENTS];
  • rounding_edge_mask(l|h=|length=|height=, r1=|d1=, r2=|d2=, [ang=], [excess=], [rounding=|chamfer=]) [ATTACHMENTS];

Description:

Creates a mask shape that can be used to round a straight edge at any angle, with different rounding radii at each end. The corner of the mask appears on the Z axis with one face on the XZ plane. You must align the mask corner with the edge you want to round. If your parent object is a cuboid, the easiest way to do this is to use diff() and edge_mask(). However, this method is somewhat inflexible regarding orientation of a tapered mask, and it does not support other parent shapes. You can attach the mask to a larger range of shapes using attach() to anchor the LEFT+FWD anchor of the mask to a desired corner on the parent with inside=true. Many shapes propagate $edge_angle and $edge_length which can aid in configuring the mask, and you can adjust the mask as needed to align the taper as desired. The default "remove" tag is set so diff() will automatically difference away the mask. You can of course also position the mask manually and use difference().

For mating with other roundings or chamfers on cuboids or regular prisms, you can choose end roundings and end chamfers. These affect only the curved edge of the mask ends and will only work if the terminating face is perpendicular to the masked edge. The excess parameter will add extra length to the mask when you use these settings.

Arguments:

By Position What it does
l / h / length / height Length of mask. Default: $edge_length if defined
r Radius of the rounding.
ang Angle between faces for rounding. Default: $edge_angle if defined, otherwise 90
By Name What it does
r1 Bottom radius of rounding.
r2 Top radius of rounding.
d Diameter of the rounding.
d1 Bottom diameter of rounding.
d2 Top diameter of rounding.
excess Extra size for the mask. Defaults: 0.1
rounding Radius of roundong along ends. Default: 0
rounding1 Radius of rounding along bottom end
rounding2 Radius of rounding along top end
chamfer Chamfer size of end chamfers. Default: 0
chamfer1 Chamfer size of chamfer at bottom end
chamfer2 Chamfer size of chamfer at top end
anchor Translate so anchor point is at origin (0,0,0). See anchor. Default: CENTER
spin Rotate this many degrees around the Z axis after anchor. See spin. Default: 0
orient Vector to rotate top towards, after spin. See orient. Default: UP

Side Effects:

  • Tags the children with "remove" (and hence sets $tag) if no tag is already set.

Example 1:

rounding\_edge\_mask() Example 1 
include <BOSL2/std.scad>
rounding_edge_mask(l=50, r=15);



Example 2: With different radii at each end

rounding\_edge\_mask() Example 2 
include <BOSL2/std.scad>
rounding_edge_mask(l=50, r1=10, r2=25);



Example 3: Acute angle

rounding\_edge\_mask() Example 3 
include <BOSL2/std.scad>
rounding_edge_mask(l=50, r=10, ang=45);



Example 4: A large excess

rounding\_edge\_mask() Example 4 
include <BOSL2/std.scad>
rounding_edge_mask(l=50, r=15,excess=4);



Example 5: Subtracting from a cube

rounding\_edge\_mask() Example 5 
include <BOSL2/std.scad>
difference() {
    cube(size=100, center=false);
    #rounding_edge_mask(l=100, r=25, anchor=BOTTOM);
}



Example 6: Varying Rounding Radius

rounding\_edge\_mask() Example 6 
include <BOSL2/std.scad>
difference() {
    cube(size=50, center=false);
    down(1)rounding_edge_mask(l=52, r1=25, r2=10, anchor=BOTTOM);
}

Example 7: Angle not 90 degrees

rounding\_edge\_mask() Example 7 
include <BOSL2/std.scad>
difference() {
    pie_slice(ang=70, h=50, d=100, center=true);
    #rounding_edge_mask(h=51, r=20.0, ang=70, $fn=32);
}



Example 8: Varying Rounding Radius

rounding\_edge\_mask() Example 8 
include <BOSL2/std.scad>
difference() {
    pie_slice(ang=70, h=50, d=100, center=true);
    #rounding_edge_mask(h=51, r1=10, r2=25, ang=70, $fn=32);
}



Example 9: Rounding a non-right angled edge, with a zero radius at the bottom.

rounding\_edge\_mask() Example 9 
include <BOSL2/std.scad>
difference(){
  linear_extrude(height=50)xflip(x=25)right_triangle([50,50]);
  rounding_edge_mask(l=51, ang=45, r1=0, r2=15, anchor=BOT);
}



Example 10: Masking by Attachment

rounding\_edge\_mask() Example 10 
include <BOSL2/std.scad>
diff()
cube(100, center=true)
    edge_mask(FRONT+RIGHT)
        #rounding_edge_mask(l=$parent_size.z+0.01, r=25);



Example 11: Multiple Masking by Attachment

rounding\_edge\_mask() Example 11 
include <BOSL2/std.scad>
diff()
cube([80,90,100], center=true) {
    let(p = $parent_size*1.01) {
        edge_mask(TOP)
            rounding_edge_mask(l=p.z, r=25);
    }
}



Example 12: Mask shape with end rounding at the top, chamfer at the bottom, and a large excess value:

rounding\_edge\_mask() Example 12 
include <BOSL2/std.scad>
rounding_edge_mask(r=10,h=20, chamfer1=3, rounding2=3, excess=1);

Example 13: Attaching masks using attach() with automatic angle and length from the parent. Note that sometimes the automatic length is too short because it is the length of the edge itself.

rounding\_edge\_mask() Example 13 
include <BOSL2/std.scad>
diff()
prismoid([20,30],[12,19], h=10,shift=[4,7])
  attach([TOP+RIGHT,RIGHT+FRONT],LEFT+FWD,inside=true)
    rounding_edge_mask(r1=2,r2=4);



Example 14: The mask does not need to be the full length of the edge

rounding\_edge\_mask() Example 14 
include <BOSL2/std.scad>
diff()
cuboid(20)
  attach(RIGHT+TOP,LEFT+FWD,inside=true,inset=-.1,align=FWD)
    rounding_edge_mask(r1=0,r2=10,length=10);



Module: rounding_corner_mask()

Synopsis: Creates a shape to round 90° corners. [Geom]

Topics: Masking, Rounding, Shapes (3D)

See Also: rounding_edge_mask(), default_tag(), diff()

Usage:

  • rounding_corner_mask(r|d, [ang], [excess=], [style=]) [ATTACHMENTS];

Description:

Creates a shape that you can use to round corners where the top and bottom faces are parallel and the two side faces are perpendicular to the top and bottom, e.g. cubes or pie_slice corners. Difference it from the object to be rounded. The center of the mask object should align exactly with the corner to be rounded.

Arguments:

By Position What it does
r Radius of corner rounding.
ang Angle of corner (measured around the z axis). Default: 90
By Name What it does
d Diameter of corner rounding.
excess Extra size for the mask. Defaults: 0.1
style The style of the sphere cutout's construction. One of "orig", "aligned", "stagger", "octa", or "icosa". Default: "octa"
anchor Translate so anchor point is at origin (0,0,0). See anchor. Default: CENTER
spin Rotate this many degrees around the Z axis after anchor. See spin. Default: 0
orient Vector to rotate top towards, after spin. See orient. Default: UP

Side Effects:

  • Tags the children with "remove" (and hence sets $tag) if no tag is already set.

Example 1:

rounding\_corner\_mask() Example 1 
include <BOSL2/std.scad>
rounding_corner_mask(r=20);



Example 2: Adding a huge excess

rounding\_corner\_mask() Example 2 
include <BOSL2/std.scad>
rounding_corner_mask(r=20, excess=5);



Example 3: Position masks manually

rounding\_corner\_mask() Example 3 
include <BOSL2/std.scad>
difference() {
    cube(size=[50, 60, 70], center=true);
    translate([-25, -30, 35])
        #rounding_corner_mask(r=20, spin=90, orient=DOWN);
    translate([25, -30, 35])
        #rounding_corner_mask(r=20, orient=DOWN);
    translate([25, -30, -35])
        #rounding_corner_mask(r=20, spin=90);
}



Example 4: Masking by Attachment

rounding\_corner\_mask() Example 4 
include <BOSL2/std.scad>
diff()
cube(size=[50, 60, 70]) {
    corner_mask(TOP)
        #rounding_corner_mask(r=20);
}



Example 5: Acute angle

rounding\_corner\_mask() Example 5 
include <BOSL2/std.scad>
ang=60;
difference() {
    pie_slice(ang=ang, h=50, r=100);
    zflip_copy(z=25)
       #rounding_corner_mask(r=20, ang=ang);
}



Example 6: Obtuse angle

rounding\_corner\_mask() Example 6 
include <BOSL2/std.scad>
ang=120;
difference() {
    pie_slice(ang=ang, h=50, r=30);
    zflip_copy(z=25)
       #rounding_corner_mask(r=20, ang=ang);
}



Module: rounding_cylinder_mask()

Synopsis: Creates a shape to round the end of a cylinder. [Geom]

Topics: Masking, Rounding, Cylinders

See Also: rounding_hole_mask(), rounding_corner_mask(), default_tag(), diff()

Usage:

  • rounding_cylinder_mask(r|d=, rounding);

Description:

Create a mask that can be used to round the end of a cylinder. Difference it from the cylinder to be rounded. The center of the mask object should align exactly with the center of the end of the cylinder to be rounded.

Arguments:

By Position What it does
r Radius of cylinder.
rounding Radius of the edge rounding.
By Name What it does
d Diameter of cylinder.
anchor Translate so anchor point is at origin (0,0,0). See anchor. Default: CENTER
spin Rotate this many degrees around the Z axis after anchor. See spin. Default: 0
orient Vector to rotate top towards, after spin. See orient. Default: UP

Side Effects:

  • Tags the children with "remove" (and hence sets $tag) if no tag is already set.

Example 1:

rounding\_cylinder\_mask() Example 1 
include <BOSL2/std.scad>
difference() {
  cylinder(r=50, h=50, center=false);
  up(50) #rounding_cylinder_mask(r=50, rounding=10);
}



Example 2:

rounding\_cylinder\_mask() Example 2 
include <BOSL2/std.scad>
difference() {
  cylinder(r=50, h=50, center=false);
  up(50) rounding_cylinder_mask(r=50, rounding=10);
}



Example 3: Masking by Attachment

rounding\_cylinder\_mask() Example 3 
include <BOSL2/std.scad>
diff()
cyl(h=30, d=30) {
    attach(TOP)
      #tag("remove")
        rounding_cylinder_mask(d=30, rounding=5);
}



Module: rounding_hole_mask()

Synopsis: Creates a shape to round the edge of a round hole. [Geom]

Topics: Masking, Rounding

See Also: rounding_cylinder_mask(), rounding_corner_mask(), default_tag(), diff()

Usage:

  • rounding_hole_mask(r|d, rounding, [excess]) [ATTACHMENTS];

Description:

Create a mask that can be used to round the edge of a circular hole. Difference it from the hole to be rounded. The center of the mask object should align exactly with the center of the end of the hole to be rounded.

Arguments:

By Position What it does
r Radius of hole.
rounding Radius of the rounding.
excess The extra thickness of the mask. Default: 0.1.
By Name What it does
d Diameter of hole to rounding.
anchor Translate so anchor point is at origin (0,0,0). See anchor. Default: CENTER
spin Rotate this many degrees around the Z axis after anchor. See spin. Default: 0
orient Vector to rotate top towards, after spin. See orient. Default: UP

Side Effects:

  • Tags the children with "remove" (and hence sets $tag) if no tag is already set.

Example 1:

rounding\_hole\_mask() Example 1 
include <BOSL2/std.scad>
rounding_hole_mask(r=40, rounding=20, $fa=2, $fs=2);



Example 2:

rounding\_hole\_mask() Example 2 
include <BOSL2/std.scad>
difference() {
  cube([150,150,100], center=true);
  cylinder(r=50, h=100.1, center=true);
  up(50) #rounding_hole_mask(r=50, rounding=10);
}

Example 3:

rounding\_hole\_mask() Example 3 
include <BOSL2/std.scad>
difference() {
  cube([150,150,100], center=true);
  cylinder(r=50, h=100.1, center=true);
  up(50) rounding_hole_mask(r=50, rounding=10);
}

Section: Teardrop Masking

Module: teardrop_edge_mask()

Synopsis: Creates a shape to round a 90° edge but limit the angle of overhang. [Geom]

Topics: Masking, Rounding, Shapes (3D), FDM Optimized

See Also: teardrop_corner_mask(), default_tag(), diff()

Usage:

  • teardrop_edge_mask(l|h=|length=|height=, r|d=, [angle], [excess], [anchor], [spin], [orient]) [ATTACHMENTS];

Description:

Makes an apropriate 3D edge rounding mask that keeps within angle degrees of vertical.

Arguments:

By Position What it does
l / h / length / height length of mask
r Radius of the mask rounding.
angle Maximum angle from vertical. Default: 45
excess Excess mask size. Default: 0.1
By Name What it does
d Diameter of the mask rounding.
anchor Translate so anchor point is at origin (0,0,0). See anchor. Default: CENTER
spin Rotate this many degrees around the Z axis after anchor. See spin. Default: 0
orient Vector to rotate top towards, after spin. See orient. Default: UP

Side Effects:

  • Tags the children with "remove" (and hence sets $tag) if no tag is already set.

Example 1:

teardrop\_edge\_mask() Example 1 
include <BOSL2/std.scad>
teardrop_edge_mask(l=20, r=10, angle=40);



Example 2:

teardrop\_edge\_mask() Example 2 
include <BOSL2/std.scad>
diff()
cuboid([50,60,70],rounding=10,edges="Z",anchor=CENTER) {
    edge_mask(BOT)
        teardrop_edge_mask(l=max($parent_size)+1, r=10, angle=40);
    corner_mask(BOT)
        teardrop_corner_mask(r=10, angle=40);
}

Module: teardrop_corner_mask()

Synopsis: Creates a shape to round a 90° corner but limit the angle of overhang. [Geom]

Topics: Masking, Rounding, Shapes (3D), FDM Optimized

See Also: teardrop_edge_mask(), default_tag(), diff()

Usage:

  • teardrop_corner_mask(r|d=, [angle], [excess], [anchor], [spin], [orient]) [ATTACHMENTS];

Description:

Makes an apropriate 3D corner rounding mask that keeps within angle degrees of vertical.

Arguments:

By Position What it does
r Radius of the mask rounding.
angle Maximum angle from vertical. Default: 45
excess Excess mask size. Default: 0.1
By Name What it does
d Diameter of the mask rounding.
anchor Translate so anchor point is at origin (0,0,0). See anchor. Default: CENTER
spin Rotate this many degrees around the Z axis after anchor. See spin. Default: 0
orient Vector to rotate top towards, after spin. See orient. Default: UP

Side Effects:

  • Tags the children with "remove" (and hence sets $tag) if no tag is already set.

Example 1:

teardrop\_corner\_mask() Example 1 
include <BOSL2/std.scad>
teardrop_corner_mask(r=20, angle=40);



Example 2:

teardrop\_corner\_mask() Example 2 
include <BOSL2/std.scad>
diff()
cuboid([50,60,70],rounding=10,edges="Z",anchor=CENTER) {
    edge_profile(BOT)
        mask2d_teardrop(r=10, angle=40);
    corner_mask(BOT)
        teardrop_corner_mask(r=10, angle=40);
}



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