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cubetruss.scad
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cubetruss.scad
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//////////////////////////////////////////////////////////////////////////
// LibFile: cubetruss.scad
// Parts for making modular open-frame cross-braced trusses and connectors.
// Includes:
// include <BOSL2/std.scad>
// include <BOSL2/cubetruss.scad>
//////////////////////////////////////////////////////////////////////////
$cubetruss_size = 30;
$cubetruss_strut_size = 3;
$cubetruss_bracing = true;
$cubetruss_clip_thickness = 1.6;
// Section: Cube Trusses
// Function: cubetruss_dist()
// Usage:
// cubetruss_dist(cubes, gaps, [size], [strut]);
// Description:
// Function to calculate the length of a cubetruss truss.
// Arguments:
// cubes = The number of cubes along the truss's length.
// gaps = The number of extra strut widths to add in, corresponding to each time a truss butts up against another.
// size = The length of each side of the cubetruss cubes. Default: `$cubetruss_size` (usually 30)
// strut = The width of the struts on the cubetruss cubes. Default: `$cubetruss_strut_size` (usually 3)
// Topics: Trusses
function cubetruss_dist(cubes=0, gaps=0, size, strut) =
let(
size = is_undef(size)? $cubetruss_size : size,
strut = is_undef(strut)? $cubetruss_strut_size : strut
) cubes*(size-strut)+gaps*strut;
// Module: cubetruss_segment()
// Usage:
// cubetruss_segment([size], [strut], [bracing]);
// Description:
// Creates a single cubetruss cube segment.
// Arguments:
// size = The length of each side of the cubetruss cubes. Default: `$cubetruss_size` (usually 30)
// strut = The width of the struts on the cubetruss cubes. Default: `$cubetruss_strut_size` (usually 3)
// bracing = If true, adds internal cross-braces. Default: `$cubetruss_bracing` (usually true)
// ---
// anchor = Translate so anchor point is at origin (0,0,0). See [anchor](attachments.scad#anchor). Default: `CENTER`
// spin = Rotate this many degrees around the Z axis. See [spin](attachments.scad#spin). Default: `0`
// orient = Vector to rotate top towards. See [orient](attachments.scad#orient). Default: `UP`
// Topics: Attachable, Trusses
// Examples:
// cubetruss_segment(bracing=false);
// cubetruss_segment(bracing=true);
// cubetruss_segment(strut=4);
// cubetruss_segment(size=40);
module cubetruss_segment(size, strut, bracing, anchor=CENTER, spin=0, orient=UP) {
size = is_undef(size)? $cubetruss_size : size;
strut = is_undef(strut)? $cubetruss_strut_size : strut;
bracing = is_undef(bracing)? $cubetruss_bracing : bracing;
h = size;
crossthick = strut/sqrt(2);
voffset = 0.333;
attachable(anchor,spin,orient, size=[size,size,size]) {
render(convexity=10)
union() {
difference() {
// Start with a cube.
cube([size, size, h], center=true);
cube([size-strut*2, size-strut*2, h-strut*2], center=true);
// Hollow out octogons in X and Y axes.
zrot_copies([0,90]) {
xrot(90) zrot(180/8) cylinder(h=max(h,size)+1, d=(min(h,size)-2*strut)/cos(180/8), center=true, $fn=8);
}
// Hollow out octogon vertically.
zrot(180/8) cylinder(h=max(h,size)+1, d=(min(h,size)-2*strut)/cos(180/8), center=true, $fn=8);
}
// Interior cross-supports
if (bracing) {
for (i = [-1,1]) {
zrot(i*45) {
difference() {
cube([crossthick, (size-strut)*sqrt(2), h], center=true);
up(i*voffset) {
yscale(1.3) {
yrot(90) {
zrot(180/6) {
cylinder(h=crossthick+1, d=(min(h,size)-2*strut)/cos(180/6)-2*voffset, center=true, $fn=6);
}
}
}
}
}
}
}
}
}
children();
}
}
// Module: cubetruss_support()
// Usage:
// cubetruss_support([size], [strut]);
// Description:
// Creates a single cubetruss support.
// Arguments:
// size = The length of each side of the cubetruss cubes. Default: `$cubetruss_size` (usually 30)
// strut = The width of the struts on the cubetruss cubes. Default: `$cubetruss_strut_size` (usually 3)
// extents = If given as an integer, specifies the number of vertical segments for the support. If given as a list of 3 integers, specifies the number of segments in the X, Y, and Z directions. Default: 1.
// ---
// anchor = Translate so anchor point is at origin (0,0,0). See [anchor](attachments.scad#anchor). Default: `CENTER`
// spin = Rotate this many degrees around the Z axis. See [spin](attachments.scad#spin). Default: `0`
// orient = Vector to rotate top towards. See [orient](attachments.scad#orient). Default: `UP`
// Topics: Attachable, Trusses
// Example(VPT=[0,0,0],VPD=150):
// cubetruss_support();
// Example(VPT=[0,0,0],VPD=200):
// cubetruss_support(extents=2);
// Example(VPT=[0,0,0],VPD=250):
// cubetruss_support(extents=3);
// Example(VPT=[0,0,0],VPD=350):
// cubetruss_support(extents=[2,2,3]);
// Example(VPT=[0,0,0],VPD=150):
// cubetruss_support(strut=4);
// Example(VPT=[0,0,0],VPD=260):
// cubetruss_support(extents=2) show_anchors();
module cubetruss_support(size, strut, extents=1, anchor=CENTER, spin=0, orient=UP) {
extents = is_num(extents)? [1,1,extents] : extents;
size = is_undef(size)? $cubetruss_size : size;
strut = is_undef(strut)? $cubetruss_strut_size : strut;
assert(is_int(extents.x) && extents.x > 0);
assert(is_int(extents.y) && extents.y > 0);
assert(is_int(extents.z) && extents.z > 0);
w = (size-strut) * extents.x + strut;
l = (size-strut) * extents.y + strut;
h = (size-strut) * extents.z + strut;
attachable(anchor,spin,orient, size=[w,l,h], size2=[l,0], shift=[0,l/2], axis=DOWN) {
xcopies(size-strut, n=extents.x) {
difference() {
half_of(BACK/extents.y + UP/extents.z, s=size*(max(extents)+1))
cube([size,l,h], center=true);
half_of(BACK/extents.y + UP/extents.z, cp=strut, s=size*(max(extents)+1)) {
ycopies(size-strut, n=extents.y) {
zcopies(size-strut, n=extents.z) {
cyl(h=size+1, d=size-2*strut, circum=true, realign=true, orient=RIGHT, $fn=8);
cyl(h=size+1, d=size-2*strut, circum=true, realign=true, $fn=8);
cube(size-2*strut, center=true);
}
}
}
zcopies(size-strut, n=extents.z) {
cyl(h=extents.y*size+1, d=size-2*strut, circum=true, realign=true, orient=BACK, $fn=8);
}
}
}
children();
}
}
// Module: cubetruss_clip()
// Usage:
// cubetruss_clip(extents, [size], [strut], [clipthick]);
// Description:
// Creates a pair of clips to add onto the end of a truss.
// Arguments:
// extents = How many cubes to separate the clips by.
// size = The length of each side of the cubetruss cubes. Default: `$cubetruss_size` (usually 30)
// strut = The width of the struts on the cubetruss cubes. Default: `$cubetruss_strut_size` (usually 3)
// clipthick = The thickness of the clip. Default: `$cubetruss_clip_thickness` (usually 1.6)
// ---
// anchor = Translate so anchor point is at origin (0,0,0). See [anchor](attachments.scad#anchor). Default: `CENTER`
// spin = Rotate this many degrees around the Z axis. See [spin](attachments.scad#spin). Default: `0`
// orient = Vector to rotate top towards. See [orient](attachments.scad#orient). Default: `UP`
// Topics: Attachable, Trusses
// Examples:
// cubetruss_clip(extents=2);
// cubetruss_clip(extents=1);
// cubetruss_clip(clipthick=2.5);
module cubetruss_clip(extents=1, size, strut, clipthick, anchor=CENTER, spin=0, orient=UP) {
size = is_undef(size)? $cubetruss_size : size;
strut = is_undef(strut)? $cubetruss_strut_size : strut;
clipthick = is_undef(clipthick)? $cubetruss_clip_thickness : clipthick;
cliplen = strut * 2.6;
clipheight = min(size+strut, size/3+2*strut*2.6);
clipsize = 0.5;
s = [extents*(size-strut)+strut+2*clipthick, strut*2, clipheight-2*strut];
attachable(anchor,spin,orient, size=s) {
xflip_copy(offset=(extents*(size-strut)+strut)/2) {
difference() {
union() {
difference() {
right(clipthick/2-0.01) {
back(strut) {
difference() {
xrot(90) prismoid([clipthick, clipheight], [clipthick, clipheight-cliplen*2], h=cliplen);
right(clipthick/2) chamfer_edge_mask(l=clipheight+0.1, chamfer=clipthick);
}
}
}
fwd(strut*3/2) {
cube([$slop, strut*3, size], center=true);
}
}
right($slop/2+0.01) {
fwd(strut*1.25+$slop) {
yrot(-90) prismoid([clipheight-cliplen*2, strut/2], [clipheight-cliplen*2-2*clipsize, strut/2], h=clipsize+0.01);
}
}
}
fwd(strut*1.6) {
left(clipsize) {
yscale(1.5) chamfer_edge_mask(l=size+1, chamfer=clipsize+clipthick/3);
}
}
zcopies(clipheight-strut) cube([clipthick*3, cliplen*2, strut], center=true);
zcopies(clipheight-2*strut) right(clipthick) chamfer_edge_mask(l=cliplen*2, chamfer=clipthick, orient=BACK);
}
}
children();
}
}
// Module: cubetruss_foot()
// Usage:
// cubetruss_foot(w, [size], [strut], [clipthick]);
// Description:
// Creates a foot that can be clipped onto the bottom of a truss for support.
// Arguments:
// w = The number of cube segments to span between the clips. Default: 1
// size = The length of each side of the cubetruss cubes. Default: `$cubetruss_size` (usually 30)
// strut = The width of the struts on the cubetruss cubes. Default: `$cubetruss_strut_size` (usually 3)
// clipthick = The thickness of the clips. Default: `$cubetruss_clip_thickness` (usually 1.6)
// ---
// anchor = Translate so anchor point is at origin (0,0,0). See [anchor](attachments.scad#anchor). Default: `CENTER`
// spin = Rotate this many degrees around the Z axis. See [spin](attachments.scad#spin). Default: `0`
// orient = Vector to rotate top towards. See [orient](attachments.scad#orient). Default: `UP`
// Topics: Attachable, Trusses
// Examples:
// cubetruss_foot(w=1);
// cubetruss_foot(w=3);
module cubetruss_foot(w=1, size, strut, clipthick, anchor=CENTER, spin=0, orient=UP) {
size = is_undef(size)? $cubetruss_size : size;
strut = is_undef(strut)? $cubetruss_strut_size : strut;
clipthick = is_undef(clipthick)? $cubetruss_clip_thickness : clipthick;
clipsize = 0.5;
wall_h = strut+clipthick*1.5;
cyld = (size-2*strut)/cos(180/8);
s = [w*(size-strut)+strut+2*clipthick, size-2*strut, strut+clipthick];
attachable(anchor,spin,orient, size=s, offset=[0,0,(strut-clipthick)/2]) {
down(clipthick) {
// Base
up(clipthick/2) {
cuboid([w*(size-strut)+strut+2*clipthick, size-2*strut, clipthick], chamfer=strut, edges=edges("Z"));
}
// Walls
xcopies(w*(size-strut)+strut+clipthick) {
up(clipthick-0.01) {
prismoid([clipthick, (size-4*strut)], [clipthick, size/3.5], h=wall_h, anchor=BOT);
}
}
// Horiz Wall Clips
up(clipthick+strut+$slop*2) {
xcopies(w*(size-strut)+strut) {
prismoid([clipsize*2, size/3.5], [0.1, size/3.5], h=clipsize*3, anchor=BOT);
}
}
// Middle plugs
for (xcol = [0:w-1]) {
right((xcol-(w-1)/2)*(size-strut)) {
difference() {
// Start with octagon to fit sides.
up(clipthick-0.01) {
zrot(180/8) cylinder(h=strut, d1=cyld-4*$slop, d2=cyld-4*$slop-1, center=false, $fn=8);
}
// Bevel to fit.
up(clipthick+strut) {
ycopies(size-2*strut-4*$slop) {
chamfer_edge_mask(l=size-strut, chamfer=strut*2/3, orient=RIGHT);
}
}
// Cut out X for possible top mount.
zrot_copies([-45, 45]) {
cube([size*3, strut/sqrt(2)+2*$slop, size*3], center=true);
}
}
}
}
}
children();
}
}
// Module: cubetruss_joiner()
// Usage:
// cubetruss_joiner([w], [vert], [size], [strut], [clipthick]);
// Description:
// Creates a part to join two cubetruss trusses end-to-end.
// Arguments:
// w = The number of cube segments to span between the clips. Default: 1
// vert = If true, add vertical risers to clip to the ends of the cubetruss trusses. Default: true
// size = The length of each side of the cubetruss cubes. Default: `$cubetruss_size` (usually 30)
// strut = The width of the struts on the cubetruss cubes. Default: `$cubetruss_strut_size` (usually 3)
// clipthick = The thickness of the clips. Default: `$cubetruss_clip_thickness` (usually 1.6)
// ---
// anchor = Translate so anchor point is at origin (0,0,0). See [anchor](attachments.scad#anchor). Default: `CENTER`
// spin = Rotate this many degrees around the Z axis. See [spin](attachments.scad#spin). Default: `0`
// orient = Vector to rotate top towards. See [orient](attachments.scad#orient). Default: `UP`
// Topics: Attachable, Trusses
// Examples:
// cubetruss_joiner(w=1, vert=false);
// cubetruss_joiner(w=1, vert=true);
// cubetruss_joiner(w=2, vert=true, anchor=BOT);
module cubetruss_joiner(w=1, vert=true, size, strut, clipthick, anchor=CENTER, spin=0, orient=UP) {
size = is_undef(size)? $cubetruss_size : size;
strut = is_undef(strut)? $cubetruss_strut_size : strut;
clipthick = is_undef(clipthick)? $cubetruss_clip_thickness : clipthick;
clipsize = 0.5;
s = [cubetruss_dist(w,1)+2*clipthick, cubetruss_dist(2,0)-0.1, strut+clipthick];
attachable(anchor,spin,orient, size=s, offset=[0,0,-(clipthick-strut)/2]) {
down(clipthick) {
// Base
cube([w*(size-strut)+strut+2*clipthick, size, clipthick], anchor=BOT);
xcopies(w*(size-strut)+strut+clipthick) {
cube([clipthick, size, clipthick+strut*3/4], anchor=BOT);
}
// Use feet
ycopies(size) {
cubetruss_foot(w=w, size=size, strut=strut, clipthick=clipthick, anchor=BOT);
}
if (vert) {
// Vert Walls
xcopies(w*(size-strut)+strut+clipthick) {
up(clipthick-0.01) {
prismoid([clipthick, size], [clipthick, 2*strut+2*clipthick], h=size*0.6, anchor=BOT);
}
}
// Vert Wall Clips
up(size/2) {
xflip_copy(offset=(w*(size-strut)+strut+0.02)/2) {
yflip_copy(offset=strut+$slop/2) {
yrot(-90) {
back_half() {
prismoid([size/3.5, clipthick*2], [size/3.5-4*2*clipsize, 0.1], h=2*clipsize, anchor=BOT);
}
}
}
}
}
}
}
children();
}
}
// Module: cubetruss_uclip()
// Usage:
// cubetruss_uclip(dual, [size], [strut], [clipthick]);
// Description:
// Creates a small clip that can snap around one or two adjacent struts.
// Arguments:
// dual = If true, create a clip to clip around two adjacent struts. If false, just fit around one strut. Default: true
// size = The length of each side of the cubetruss cubes. Default: `$cubetruss_size` (usually 30)
// strut = The width of the struts on the cubetruss cubes. Default: `$cubetruss_strut_size` (usually 3)
// clipthick = The thickness of the clips. Default: `$cubetruss_clip_thickness` (usually 1.6)
// ---
// anchor = Translate so anchor point is at origin (0,0,0). See [anchor](attachments.scad#anchor). Default: `CENTER`
// spin = Rotate this many degrees around the Z axis. See [spin](attachments.scad#spin). Default: `0`
// orient = Vector to rotate top towards. See [orient](attachments.scad#orient). Default: `UP`
// Topics: Attachable, Trusses
// Examples:
// cubetruss_uclip(dual=false);
// cubetruss_uclip(dual=true);
module cubetruss_uclip(dual=true, size, strut, clipthick, anchor=CENTER, spin=0, orient=UP) {
size = is_undef(size)? $cubetruss_size : size;
strut = is_undef(strut)? $cubetruss_strut_size : strut;
clipthick = is_undef(clipthick)? $cubetruss_clip_thickness : clipthick;
clipsize = 0.5;
s = [(dual?2:1)*strut+2*clipthick+$slop, strut+2*clipthick, size/3.5];
attachable(anchor,spin,orient, size=s) {
union() {
difference() {
cube(s, center=true);
back(clipthick) cube([(dual?2:1)*strut+$slop, strut+2*clipthick, size+1], center=true);
}
back((strut+$slop)/2) {
xflip_copy(offset=(dual?1:0.5)*strut+$slop/2) {
yrot(-90) {
back_half() {
prismoid([size/3.5, clipthick*1.87], [size/3.5, 0.1], h=clipsize, anchor=BOT);
}
}
}
}
}
children();
}
}
// Module: cubetruss()
// Usage:
// cubetruss(extents, [clips], [bracing], [size], [strut], [clipthick]);
// Description:
// Creates a cubetruss truss, assembled out of one or more cubical segments.
// Arguments:
// extents = The number of cubes in length to make the truss. If given as a [X,Y,Z] vector, specifies the number of cubes in each dimension.
// clips = List of vectors pointing towards the sides to add clips to.
// size = The length of each side of the cubetruss cubes. Default: `$cubetruss_size` (usually 30)
// strut = The width of the struts on the cubetruss cubes. Default: `$cubetruss_strut_size` (usually 3)
// bracing = If true, adds internal cross-braces. Default: `$cubetruss_bracing` (usually true)
// clipthick = The thickness of the clips. Default: `$cubetruss_clip_thickness` (usually 1.6)
// ---
// anchor = Translate so anchor point is at origin (0,0,0). See [anchor](attachments.scad#anchor). Default: `CENTER`
// spin = Rotate this many degrees around the Z axis. See [spin](attachments.scad#spin). Default: `0`
// orient = Vector to rotate top towards. See [orient](attachments.scad#orient). Default: `UP`
// Topics: Attachable, Trusses
// Examples:
// cubetruss(extents=3);
// cubetruss(extents=3, clips=FRONT);
// cubetruss(extents=3, clips=[FRONT,BACK]);
// cubetruss(extents=[2,3]);
// cubetruss(extents=[1,4,2]);
// cubetruss(extents=[1,4,2], bracing=false);
module cubetruss(extents=6, clips=[], bracing, size, strut, clipthick, anchor=CENTER, spin=0, orient=UP) {
clips = is_vector(clips)? [clips] : clips;
size = is_undef(size)? $cubetruss_size : size;
strut = is_undef(strut)? $cubetruss_strut_size : strut;
bracing = is_undef(bracing)? $cubetruss_bracing : bracing;
clipthick = is_undef(clipthick)? $cubetruss_clip_thickness : clipthick;
extents = is_vector(extents)? point3d(extents,fill=1) : [1,extents,1];
w = extents[0];
l = extents[1];
h = extents[2];
s = [cubetruss_dist(w,1), cubetruss_dist(l,1), cubetruss_dist(h,1)];
attachable(anchor,spin,orient, size=s) {
union() {
for (zrow = [0:h-1]) {
up((zrow-(h-1)/2)*(size-strut)) {
for (xcol = [0:w-1]) {
right((xcol-(w-1)/2)*(size-strut)) {
for (ycol = [0:l-1]) {
back((ycol-(l-1)/2)*(size-strut)) {
cubetruss_segment(size=size, strut=strut, bracing=bracing);
}
}
}
}
}
}
if (clipthick > 0) {
for (vec = clips) {
exts = v_abs(rot(from=FWD, to=vec, p=extents));
rot(from=FWD,to=vec) {
for (zrow = [0:1:exts.z-1]) {
up((zrow-(exts.z-1)/2)*(size-strut)) {
fwd((exts.y*(size-strut)+strut)/2) {
cubetruss_clip(size=size, strut=strut, extents=exts.x, clipthick=clipthick);
}
}
}
}
}
}
}
children();
}
}
// Module: cubetruss_corner()
// Usage:
// cubetruss_corner(h, extents, [bracing], [size], [strut], [clipthick]);
// Description:
// Creates a corner cubetruss with extents jutting out in one or more directions.
// Arguments:
// h = The number of cubes high to make the base and horizontal extents.
// extents = The number of cubes to extend beyond the corner. If given as a vector of cube counts, gives the number of cubes to extend right, back, left, front, and up in order.
// size = The length of each side of the cubetruss cubes. Default: `$cubetruss_size` (usually 30)
// strut = The width of the struts on the cubetruss cubes. Default: `$cubetruss_strut_size` (usually 3)
// bracing = If true, adds internal cross-braces. Default: `$cubetruss_bracing` (usually true)
// clipthick = The thickness of the clips. Default: `$cubetruss_clip_thickness` (usually 1.6)
// ---
// anchor = Translate so anchor point is at origin (0,0,0). See [anchor](attachments.scad#anchor). Default: `CENTER`
// spin = Rotate this many degrees around the Z axis. See [spin](attachments.scad#spin). Default: `0`
// orient = Vector to rotate top towards. See [orient](attachments.scad#orient). Default: `UP`
// Topics: Attachable, Trusses
// Examples:
// cubetruss_corner(extents=2);
// cubetruss_corner(extents=2, h=2);
// cubetruss_corner(extents=[3,3,0,0,2]);
// cubetruss_corner(extents=[3,0,3,0,2]);
// cubetruss_corner(extents=[3,3,3,3,2]);
module cubetruss_corner(h=1, extents=[1,1,0,0,1], bracing, size, strut, clipthick, anchor=CENTER, spin=0, orient=UP) {
size = is_undef(size)? $cubetruss_size : size;
strut = is_undef(strut)? $cubetruss_strut_size : strut;
bracing = is_undef(bracing)? $cubetruss_bracing : bracing;
clipthick = is_undef(clipthick)? $cubetruss_clip_thickness : clipthick;
exts = is_vector(extents)? list_fit(extents,5,fill=0) : [extents, extents, 0, 0, extents];
s = [cubetruss_dist(exts[0]+1+exts[2],1), cubetruss_dist(exts[1]+1+exts[3],1), cubetruss_dist(h+exts[4],1)];
offset = [cubetruss_dist(exts[0]-exts[2],0), cubetruss_dist(exts[1]-exts[3],0), cubetruss_dist(h+exts[4]-1,0)]/2;
attachable(anchor,spin,orient, size=s, offset=offset) {
union() {
for (zcol = [0:h-1]) {
up((size-strut)*zcol) {
cubetruss_segment(size=size, strut=strut, bracing=bracing);
}
}
for (dir = [0:3]) {
if (exts[dir] != undef && exts[dir] > 0) {
zrot(dir*90) {
for (zcol = [0:h-1]) {
up((size-strut+0.01)*zcol) {
for (i = [1:exts[dir]]) {
right((size-strut+0.01)*i) cubetruss_segment(size=size, strut=strut, bracing=bracing);
}
if (clipthick > 0) {
right(exts[dir]*(size-strut)+size/2) {
zrot(90) cubetruss_clip(size=size, strut=strut, clipthick=clipthick);
}
}
}
}
}
}
}
if (exts[4] != undef && exts[4] > 0) {
for (i = [1:exts[4]]) {
up((size-strut+0.01)*(i+h-1)) cubetruss_segment(size=size, strut=strut, bracing=bracing);
}
if (clipthick > 0) {
up((exts[4]+h-1)*(size-strut)+size/2) {
xrot(-90) cubetruss_clip(size=size, strut=strut, clipthick=clipthick);
}
}
}
}
children();
}
}
// vim: expandtab tabstop=4 shiftwidth=4 softtabstop=4 nowrap