[Coco] 3d printed EPROM cartridge housings
Mark J. Blair
nf6x at nf6x.net
Mon Nov 2 21:16:40 EST 2015
> On Oct 26, 2015, at 10:55 , chadbh74 <chadbh74 at hotmail.com> wrote:
> I'm in the works of building a delta 3d printer that I plan on using to
> Make, among other things, cases for EPROM boards. I've been working
> on the layout for each half of the cartridge in Google Sketch up 3d
> modeler, which I can export to the needed .STL format and convert to
> .gcode from there. I was wondering though if perhaps someone already
> had a perfected layout in STL they might share for reference. I intend
> to make a version with a slot for my external controllers. The jhead I
> ordered is all metal and is supposed to be able to do many types of
> materials, although I've only ordered PLA and ABS for the time being to
> experiment with which would be best for different cases. If anyone
> could offer any insight Into this I would greatly appreciate it.
Coincidentally, over the weekend I decided to release the solid model that I created a couple months ago for CoCo Program Pak housings:
The model is as close as I could get it to the original housings, including draft angles needed for injection molding. The only major detail that I couldn't get right was the edge blending of the finger slots.
I've tried having it printed in the SLS process at Shapeways, with good but not perfect results. I plan to make a YouTube video about that fairly soon, and I also plan to revise the design for better results at Shapeways. I'll make it available there for purchase after I revise the design, but I won't be surprised if nobody chooses to buy it there. Given the cost of printing in their SLS process, I'll be asking for $68.09 for it, with a very small profit margin. But if I ever become a billionaire, then I'll have tooling made to mold new cases for cheap. :)
Another collector who has an FDM 3D printer tried printing my model, and shared pictures in a conversation on Twitter. He mounted one of my CoCoEPROMpak cards inside. Here are some highlights:
and here's my CoCoEPROMpak card:
A modified design made to work better on common FDM printers would probably yield much better results.
Mark J. Blair, NF6X <nf6x at nf6x.net>
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