Error: Duplicate lpart id's

[krbeesley]

I'm still having problems running laserscad on OS X. Here's the background:

On OS X v 10.13.6
Using laserscad v0.3.2

$ which openscad
returns /usr/local/bin/openscad

which is an executable bash script that looks like this:

#!/bin/bash
/Applications/OpenSCAD.app/Contents/MacOS/OpenSCAD $*

When I cd to the new v0.3.2 laserscad/dist and
invoke

$ make cut model=/Users/beesley/perso/shop/3D/openscad/projects/pads/pads.scad

it creates directory _laserscad_temp/ in pads/, puts file pads.echo in it, and then finds an error,
returning

$ make cut model=/Users/beesley/perso/shop/3D/openscad/projects/pads/pads.scad
Getting object bounding boxes...
OpenSCAD reports:
WARNING: Ignoring unknown variable 'lidentify'.
WARNING: Ignoring unknown variable 'lmargin'.
WARNING: Ignoring unknown variable 'lkerf'.
Error: Duplicate lpart id's: pad
make: *** [/Users/beesley/perso/shop/3D/openscad/projects/pads/_laserscad_temp/pads_bb.csv] Error 1

and exits. There's no further output.

The pads.scad file looks like this:
// pads.scad
// Kenneth R. Beesley
/*
Design pads (basically just circles) for saxophone keys to be cut
out of material by a laser cutter

The "material" will be a sandwich of neoprene rubber sheet (1/16"
to 1/8" thick) with a card backing already glued on.  The laser
cutter will need to cut through the rubber and the card backing.

The thickness of the material will vary.  Needs to be specified
for the laser-cutter, I assume?

*/

include <laserscad.scad>

// width of cut left by the laser cutter (see details of the machine)
kerf = 0.5;

thickness = 3; // affects only the development preview in OpenSCAD

// $fn value controls the roundness of the circles
$fn = 200;
font_color = "black";
font_size = 1.5;

module pad(diam) {
lpart("pad", [diam, diam]) {
// text to be engraved
lengrave(thickness, true){
color(font_color)
text(font="DejaVu Sans", size=font_size, str(diam),
halign="center", valign="center");
}
// engrave the text onto a basic cylinder
cylinder(h=thickness, d=diam + kerf);

}

}

module pad_with_hole(odiam, idiam) {
lpart("pad_with_hole", [odiam, odiam]) {
// text to be engraved
lengrave(thickness, true){
color(font_color)
translate([0, 2, 0])
text(font="DejaVu Sans", size=font_size, str(odiam), halign="center",
valign="center");
}

    // engrave the text onto a cylinder with a hole in the middle
    difference() {
        cylinder(h=thickness, d=odiam + kerf);

        translate([0, 0, -1])
        cylinder(h=thickness + 2, d=idiam - kerf);
    }
}

}

union() {
translate([-24, 0, 0])
pad(8.5);

translate([-13, 0, 0])
pad(10);

pad(13);

translate([16, 0, 0])
pad_with_hole(15, 2);

}

********* end of pads.scad ********

So that's where I'm stuck.

What do I need to do to get this working?

Thanks,

Ken

[mbugert]

Hi Ken,

the library requires each lpart to have a unique name so that it can identify them during the arrangement process later on. You define an lpart named pad and instantiate it three times, therefore it returns Error: Duplicate lpart id's: pad.

A quick fix would be to include the diameter in the lpart names, i.e. by writing lpart(str("pad", diam), [diam, diam]) and lpart(str("pad_with_hole", odiam, idiam), [odiam, odiam]).

If you need multiple pads of the same diameter, this will fail for the same reason as before of course. You could then do the following:

include <laserscad.scad>

kerf = 0.5;
thickness = 3;
$fn = 200;
font_color = "black";
font_size = 1.5;

module pad(diam, id="") {
    lpart(str("pad", diam, id), [diam, diam]) {
        lengrave(thickness, true){
            color(font_color)
            text(font="DejaVu Sans", size=font_size, str(diam),
            halign="center", valign="center");
        }
        cylinder(h=thickness, d=diam + kerf);
    }
}

for (x=[1:4], y=[1:4]) {
    translate([x*10,y*10,0])
        pad(8, id=str(x,y));
}

[krbeesley]

On 12Sep2020, at 02:05, Michael Bugert ***@***.***> wrote: the library requires each lpart to have a unique name so that it can identify them during the arrangement process later on. You define an lpart named pad and instantiate it three times, therefore it returns Error: Duplicate lpart id's: pad.

Many thanks. I thought that every lpart _type_ needed a unique name. You’re telling me that each lpart _instance_ needs a unique name. I’ll get back on it. Many thanks, Ken ******************************* Kenneth R. Beesley, D.Phil. PO Box 540475 North Salt Lake UT 84054 USA

[mbugert]

Yeah, I agree that it's not particularly obvious from the readme. I'll update that.

I’ll get back on it.

👍👍

[krbeesley]

Hello Michael, Thanks for the updates and messages. When I run your code sample (from the message below) or my own code, with the modifications that you describe, I get the following ValueError message: beesley$ make cut model=/Users/beesley/perso/shop/3D/openscad/projects/pads/pads-bugert.scad Getting object bounding boxes... OpenSCAD reports: WARNING: Ignoring unknown function 'is_undef'. WARNING: Ignoring unknown variable 'lkerf'. WARNING: Ignoring unknown variable 'lmargin'. WARNING: Ignoring unknown variable 'lidentify'. Optimizing object placement... Traceback (most recent call last): File "util/column_packing.py", line 61, in <module> pack(*sys.argv[1:]) File "util/column_packing.py", line 32, in pack objects = [(name, float(x), float(y)) for name, x, y in list(reader)] File "util/column_packing.py", line 32, in <listcomp> objects = [(name, float(x), float(y)) for name, x, y in list(reader)] ValueError: could not convert string to float: 'undef' make: *** [/Users/beesley/perso/shop/3D/openscad/projects/pads/_laserscad_temp/pads-bugert_pos.csv] Error 1 What’s going on here? Thanks, Ken

On 12Sep2020, at 02:05, Michael Bugert ***@***.***> wrote: Hi Ken, the library requires each lpart to have a unique name so that it can identify them during the arrangement process later on. You define an lpart named pad and instantiate it three times, therefore it returns Error: Duplicate lpart id's: pad. A quick fix would be to include the diameter in the lpart names, i.e. by writing lpart(str("pad", diam), [diam, diam]) and lpart(str("pad_with_hole", odiam, idiam), [odiam, odiam]). If you need multiple pads of the same diameter, this will fail for the same reason as before of course. You could then do the following: include <laserscad.scad> kerf = 0.5; thickness = 3; $fn = 200; font_color = "black"; font_size = 1.5; module pad(diam, id="") { lpart(str("pad", diam, id), [diam, diam]) { lengrave(thickness, true){ color(font_color) text(font="DejaVu Sans", size=font_size, str(diam), halign="center", valign="center"); } cylinder(h=thickness, d=diam + kerf); } } for (x=[1:4], y=[1:4]) { translate([x*10,y*10,0]) pad(8, id=str(x,y)); } — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#17 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAPIKMORXLIETGLMKP36TYLSFMTWDANCNFSM4QXVL6WQ>.

******************************* Kenneth R. Beesley, D.Phil. PO Box 540475 North Salt Lake UT 84054 USA