Arduino is a small prototyping board with ATmega microcontroller made by company Atmel. It was developed for school students to teach them how to build and program basic circuits, but because of its good documentation, simplicity and low price it's usage has spread among hobby developers. Nowadays it is often used as a brain of small DIY programmable devices.
It's been a few years since i last upgraded my 3D printer. During this time a lot of new printer features were invented and several parts got cheap enough for me. Also my printer was havilly used and few parts started to show that thay are worn out. It's time for a bigger maintenance.
The first version of my 3D printer was working fine, but as time passed, I found few things that could be improved.
I built my own 3D printer based on open hardware RepRap printer Rebelix X2, but improved by my own design customizations. Printer consists of plastic parts made by similar 3D printer (I used 3D printers at Czech Technical University), standard aluminium profiles, stainless steel rods and bunch of nuts and screws.