Hi,

I am new to the this and OpenScad. Although I have designed a few pieces for
my 3D printer that worked great. This simple one I am try to print will not
work correctly. The below code should print a small rectangle 28mm x 14mm x
3mm in size with two holes that are 9mm and 11mm in  diameter. When I print
the file it produces a rectangle that is 38mm x 24mm x 12mm and the holes
are 18mm and 20mm in diameter. I just can't seem to find my error. The
simple code I am using is posted below.

$fn=10;
difference() {

  cube([28, 14, 2], center=true);

translate([-8, 0, -1.5]) {
cylinder(r=4.5, h=3);
}

translate([6.5, 0, -1.5]) {
cylinder(r=5.5, h=3);

}
}

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I can't see anything wrong with your code, or the stl it produces (checked in
Netfabb), except that it's 28mm x 14mm x 2mm (which is what's written in
your code). It's like 10 got added to every dimension. Can you post the stl
file you produce here? Also, what version of OpenSCAD are you using? I'd
suspect some slicing or printer setup problem if the stl is correct.

Ian

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Thank you very much for your reply. I am running the following version of
OpenSCAD: "OpenSCAD version 2015.03-2".

Here is the stl file it created:

Extruder_Wire_Tube_Holder.stl
http://forum.openscad.org/file/n20849/Extruder_Wire_Tube_Holder.stl

Also the G-Code created by the XYZ slicer apears to be good also:

http://forum.openscad.org/file/n20849/g-code.jpg

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"38mm x 24mm x 12mm and the holes are 18mm and 20mm in diameter"

Are you sure? Diameters 18mm + 20mm = 38mm which means the holes are as big
as the rectangle is long?

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Again, the following is the whole piece of code I am trying to print! As you
can see the diameter is 9mm and the other diameter is 11mm. The printer is
setup to print in mm and all of my other prints are fine even the other
OpenSCAD files print fine. Just having an issue with this one.

"$fn=10;
difference() {

  cube([28, 14, 2], center=true);

translate([-8, 0, -1.5]) {
cylinder(r=4.5, h=3);
}

translate([6.5, 0, -1.5]) {
cylinder(r=5.5, h=3);

}
} "

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Well there is nothing wrong with the STL file that OpenSCAD creates. It must
be a problem with your slicer or printer. What are you using?

As Michael has said, I also can't imaging anything that adds 10 to all
dimensions, especially Z.

Here is the STL viewed in NetFabb

http://forum.openscad.org/file/n20855/holes.png

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I am using XYZ davinci JR and XYZ software that I believe uses Slic3R. I am
confused as other OpenSCAD projects I created work fine. They are both boxes
with lids, not as simple as this one.

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So you get an object that looks like this?

http://forum.openscad.org/file/n20858/holes.png

I just can't see how that can happen when the STL is correct. The outside
dimensions have increased by 10 and the hole diameters have increased by 9
and now overlap?

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That is great. Now you are seeing the delima I am facing. Below is a picture
of one of the items I printed.

http://forum.openscad.org/file/n20859/IMG_20170312_152952586.jpg

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