I've found jscad tends to be idea for doing edits to existing stl. This always gets errors in OpenScad.

For Example, I wanted to change the slot for aluminium extrusion from M... to OpenVslot, so I need to cut a 2020 hole, to get rid of overly large channel protrusions.

function main(){
theobj = top_section().translate([-70,-70,0]).rotateZ(-60);
thecut = cube([20,20,200]);
theobj = difference(
theobj,
thecut.translate([-16.1,47.7,0])
);
return(theobj);
}

This worked fine.

Now I'm trying to use it to combine components, and I've getting issues:

include("motor_mount.jscad");

function motor_boss()
{
//include("3DR_Bottom_Boss.stl");
}

function combined()
{
a = rotate([0,0,120], translate([14,-7.2,0], rotate([0,0,180], motor_mount())));
b = rotate([0,0,240], translate([62,-67,0], rotate([0,0,180], motor_mount())));
c = rotate([0,0,0], translate([90,4.1,0], rotate([0,0,180], motor_mount())));
return union (a,b,c);

}

//translate([5,-40,-0]) rotate([0,0,91]) cylinder(r=30,h=20,$fn=3);
function main(){
return combined();
}

When I do this, Im getting a error:
dhcp-65-139:3dr-vslot gwest$ openjscad 3dr_bottom_plate.jscad -o test.stl
converting 3dr_bottom_plate.jscad -> test.stl (STereoLithography, ASCII)
render jscad to stl
FATAL ERROR: CALL_AND_RETRY_LAST Allocation failed - process out of memory
Abort trap: 6

Any Idea Why?

Looks like I should be able to allocate bigger memory in node, but I cannot find a way of passing the flag for it.

Source: github.com/glennswest/3dr-vslot
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Jeff Gay
STL models include a huge number of polygons. Have you tried the above with a small STL model?