Marlin is one of the most popular firmware that is in charge of managing your open source printer.
Not sure if you ever wonder how Marlin movement works, but if you did, I hope the following serie of posts will bring some light to have a better understanding.
Fig. Marlin by National Geographic
[Disclaimer] this is my marlin interpretation, I might be wrong so feel free to correct me if you find any mistakes.
If you have a FDM 3D printer I am sure you know what this post IS about. Curly prints.
Whenever extruding with the nozzle far from the bed, the plastic does those funny curly spirals. No different with food.
But…what if we play with the distance between the nozzle and the bed to have funny curly patterns?
For Pinya2, I wanted to try a different extrusion approach: air extrusion. I have been playing with peristaltic extrusion, stepper driven syringe extrusion, … so I ask myself why not to try air compressed extrusion. There is lots of comments regarding which one is better or worst. At the end I think is a matter of which method is more suitable for our application. Frostruder MK2, Baricuda, Unfold, Laser Lab Studio … many people using it yet not much information available. But for sure an awesome starting point (at least for me). 
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It’s been a year since I started working on my first delta printer for food. Lots of stuff has changed since then. So a few months ago I decided to go deep and rework my Pinya printer!
#Pinya2
So the first thing to answer is why a second version?
Today it’s a nice day! I was dreaming about an open source 3d-food–inkjet-powder-bed-printer so i decide to tear down a part a printer i had around.
The idea is to build edible prints from powdered foods (i.e. sugar, salt, … ) and edible binders ( i.e. ¿?¿?).
I still have no idea how to do it, but i think is gonna be a fun trip! Powder deposition, inkjet head and software toolchain are the main parts. Luckily there is already great opensource projects out there that I can learn from!