Instant setting epoxy, resin, or plastic?

Does anyone know of something that is cheapish and suitable for 3D printing by being extruded from a thin tube, and cures immediately on contact with a dried bit of itself, or exposure to another chemical or something?  It must be practical to put though a tube at low pressure, and again, cure almost instantly once it comes out of the tube.  Traditional 3D extruders will NOT work, as the device needs to be able to distribute to hundreds of tiny tubes at once (I cant cut a plastic filament into 300 pieces lengthwise, if you can, good job!), plus that I would have only about 1/4"-1/8" x 1/4"-1/8" x 6" to fit the device into. 

There are resins that will cure almost instantly when under a UV light source. There are industrial grade 3D printers that use this kind of material since it can be laid out in a wide yet thin line to quickly produce a 3D print.

I'm guessing you want to make something like a typical ink jet printer cartridge that can dispense the liquid plastic through multiple, individually controlled, pints. The industrial grade machines that print with that king of material are able to lay out 2 to 3 inch wide strips of the material in a single pass. But the print head is about 6" cubed. Not only to accommodate the printer head but also the curing lamp.

Here is a video of one of those machines in action.
rickharris4 years ago
Super glue sets almost instantly when in contact with baking soda.

Or actually any other alkali - it neutralises the normally acidic glue to allow polymerisation.

Many thermoplastics set at a given critical temperature - if you keep them just above this to make them flow (may need more pressure) then they will cool rapidly in a mild air stream or refrigeration.

You don't cut the filament - you melt it and feed the liquid to your tube array.

In general polymerisation can be quick in the correctly designed plastic and activator (if you go that way) But is slowed to give the user time to handle the material.

Your best bet would be to talk to a plastic manufacturer with a good specification of what you need and be prepared to pay the price of development or purchase.