[OpenSCAD] sumUp() to Replace Difference() (in most cases)

pproj at posteo.de pproj at posteo.de
Thu Oct 6 15:55:31 EDT 2016


hello after few years of work on my quite complex  cad project, which i 
created using openscad .(my love to openscad was hampered by quite few a 
limittions for a compex project- but i am still working with it)
anyway,
i have decided it is time to share with others some of the things i have 
discovered and developed in the years of use.

i will start with the sumUp(). which is an advanced replacement for the 
difference() keyword and allows for holes inside modules, and reduced 
nesting producing simpler code among other things.
i have put it it under:
https://github.com/solidboredom/sumUp
but to show you why i have been using it so much: it can produce this 
example. the  code below  and the lib  is all you need
:

include<sumup.scad>

sumUp()
{
   add()
     cube([20,20,7],center=true);
   lidWithNailsAndWasher();
}

//== modules below ==
module lidWithNailsAndWasher()
{
   add()//washer
     translate([0,0,8])
        cube([20,20,1],center=true);
   addAfterRemoving()//top cover without holes
      translate([0,0,11])
        color("green")
          cube([17,17,2],center=true);
for(x=[-1,1],y=[-1,1])
   translate([x*7,y*7,2])
   {
     remove()
       cylinder(h=25,d=4.5,center=true);
    #addAfterRemoving()
       cylinder(h=10,d2=3,d1=1);
   }
}

i have been quite happy with thhe library (actually its predecessor) so 
i hope you will find it useful too.
i have been using it so much i would like to have its approach somehow 
integrated in openscad itself.
  this perhaps could resolve its main drawback: speed on complex models: 
openscad creates a lot groups and getting much slower on complex models 
than with the difference().

i would also like to share another library: essentially a human(not 
linear algebra robot) oriented syntax rewrite library for basic openscad 
operations i use a lot, but still need to make it ready for publishing 
and documented first.
so whats your take folks?
Peter
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