Injector types for the hotend, what are my options?

[teoman]

I would like to print some food items. What are my options for printing mushes .

If i get bored of food printing then a setup that could be converted to print ceramics would also be nice.

[mhackney]

I'm not aware of any injectors for printing unless you buy an entire printer (the pancake printer). But there are designs on Thingiveres to make a simple screw drive extruder that will print a range of pushes.

[IMBoring25]

The Fab@Home project had a syringe extruder too. I merely got some commercial syringes and have been planning to design a mount and extruder drive to accommodate them. Haven't gotten around to that yet.

[teoman]

That is what i had in mind.

If the cold end is strong enough maybe a bowden setup can be used. I.e the filament does not go in to the hotend but pushes the plunger of the syringe.

[Polygonhell]

There seem to be basically two approaches to this, either retrofit a syringe with a screw that will drive the plunger, or use a peristaltic pump. I think Richrap did some experiments in this space, so you might want to check out his blog.
Other sorts of pumps won't work because they pulse rather than giving a continuous stream.

[bot]

I've also seen people on YouTube or somewhere online using an Archimedean screw to drive paste or concrete or something.