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Making a GTT Desktop Case

Posted: Fri Feb 24, 2017 2:35 pm
by Aniso
I was finishing a desktop case for a GTT module and wanted to demonstrate the process.

First I start with a 3D print of our case design. This first photo is after initial application of some Bondo. The specific Bondo product is "Glazing and Spot Putty" which is a one part paste full of VOCs and cancer which requires adequate ventilation. It sticks to the PLA of the print very well, but I do sand it to roughen it up first (and remove high spots).
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After application of Bondo, it is sanded on a flat surface. It is important to build up the Bondo against a flat reference. You can not "free sand" until the very final steps. After each sanding, the object is painted with sanding primer. I do this to provide a layer of color for sanding the next coat - when I see the primer exposed, I know that I need to stop sanding. This shows the painted piece.
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Next more Bondo is applied.
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This is then carefully sanded bit by bit until as much Bondo is removed as possible without sanding beyond the previous layer.
20170201_174154.jpg (955.04 KiB) Viewed 886 times
This process is repeated until all the low spots have been filled.
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And this is the piece just before the final (or second final) application of sanding primer.
20170204_224922.jpg (713.83 KiB) Viewed 886 times
After this, the piece is sanded one last time with very fine (800) sandpaper and painted with color. I should continue this thread and fill in details. Any interest?