Prusa i3 Bear Upgrade v2.0

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# /!\ A NEW VERSION HAS BEEN RELEASED /!\

**Bear Frame 2.1** has been released and all informations are available here:
https://github.com/gregsaun/prusa_i3_bear_upgrade/blob/master/README.md

You can find all printed parts and print settings here:
https://guides.bear-lab.com/c/Frame

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# Introduction

The Bear Upgrade replaces the original [Prusa i3 MK2(S), MK2.5(S) and MK3(S)](https://www.prusa3d.com/) frame with a more rigid and reliable solution. It allows faster prints, increases precision, makes maintenance easier and opens the door to more customization. Plus it looks unique with our coloured frames!

# Why another conversion build?

Here are the features that explain why I decided to create another printer upgrade.

* Use as much as possible original parts (no need to print a new RAMBo cover nor change any cable, rods or firmware)
* Compatible with MK2, MK2s MK2.5 and MK3
* Let user choose between two versions :
* [Half upgrade](https://github.com/gregsaun/prusa_i3_bear_upgrade/tree/master/half_upgrade) : similar to MK3 and cheaper
* [Full upgrade](https://github.com/gregsaun/prusa_i3_bear_upgrade/tree/master/full_upgrade) : stronger but more expensive
* Highly detailed manual
* Use more aluminum and less printed parts (3D printed parts can crack and are less reliable)
* Use Openbuilds hardware :
* Single platform of multitude compatible hardware parts
* V-Slot offers more possibilities for printed parts…