3D printed Edge connectors - Understanding the limitations

The original Molex branded Nylon edge-connectors that are commonly used in 1970s-1980s pinball and arcade games have been discontinued for some time.  It may be possible to call Molex and special order new connectors.  However, I assume that the minimum lot order would be in the thousands, if not tens of thousands.  I can't image there being enough demand to ever break even on such an investment.  3D printing offers a practical alternative.

I would mention the two type of 3D printers available.  I will call them "Filament" and "Resin."  Filament is where a spool of colored plastic line, which resembles weed-whacker string, is extruded through a small headed nozzle.  On my printer, the item is laid down one .4mm line at at time.  Resin type is where a build plate is submerged in a small vat of UV-cured resin, and a UV display "Freezes" the resin on the build plate, one layer at a time.  The filament type is quick, easy, and clean.  The resin type is capable of very high resolution, but requires a good deal of finishing.  At this time, the Resin type is the reproduction edge connectors that we offer.

I have a few of these that have been on location for several years of real world testing.  I would consider the quality to be Acceptable.  Please understand there are limitations.

The 3D printed connectors tend to be a bit more brittle, and not quite as strong.  This isn't a problem until when - or if - you ever intend to "repin" these.  The 3D printed connectors similar feel, similar weight, and a well-crimped pin will slide into the groove with a satisfying Click.  However, the original connector pin could usually be teased out with the pin removal tool, or even a safety pin or thumbtack.  The 3D printed ones are less forgiving.  It is very easy to damage the resin seat where the pin's "tang" locks itself into the connector.  So if you make a mistake, and slip the pin in one position off, it may be tough to recover without buying a new connector and starting over.

I offer what I call a "Crimp Pin Practice Kit"

If you are a beginner, you can get some practice on your well-lighted bench or table, before contorting yourself, somewhat awkwardly, on the open door of the machine's back box