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Mummy King - A 3D print adventure

01.jpg This is “Der Mumienkönig” - “The Mummy King”. It is an ancient artifact of unbelievable worth.

Well, actually it's just a somewhat funny looking flint stone I found on our trip to Rügen earlier this year. But I like it and wanted to put it on display.

Of course a king needs to stand upright, so some kind of stand was needed and this is how my evening turned into a new 3D printing adventure…


Step 1: Measuring

The stone at the bottom is irregularly shaped. Ideally, the stone should fit perfectly into the holder, so a near perfect measurement of the shape would be needed. My idea was to take an imprint and then transfer it to a 2D sahpe somehow. Kaddi had the brilliant idea to use wax for that.

So I heated up a tealight and took an impression:

Wax Imprint Tealight tin removed

Step 2: Tracing

To transfer the shape of the imprint to the computer, I traced the border with a sharpie and put the thing to my scanner.

Traced outline in wax Scanned outline

I then imported the scan into Inkscape and traced manually traced the outline, making sure to use only straight lines - no Beziers here.

Inkscape

Now I had the right shape, but the dimensions were still wrong. I measuerd the width of the imprint with my calipers and adjusted the shape's size in Inkscape accordingly. I also moved it to position 0,0:

Size Adjustments

Step 3: Export to DXF

To get a usable DXF from my shape, I basically followed the tutorial at RepRap Prescription. It basically boils down to having a path with straight lines only.

However when saving your file as DXF, make sure to uncheck all the option in the save dialog and set the units to mm:

DXF Export

Step 4: OpenScad!

Time to make use of the shape in OpenScad. It's a simple matter of importing it and linearly extrude it along the z-axis:

linear_extrude(height=30) import("mummyking.dxf");

This gives you a 3D shap you can use to cut out a hole from any other OpenScad primitive.

OpenScad

Export your work to STL and you're ready to slice it in your favorite slicer.

Step 5: Print it

Using the excellent OctoPrint of course.

Perfect print Perfect fit

Step 6: Enjoy!

Posted on Friday, February the 15th 2013 (20 months ago).

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