# Prusa i3 Bear Upgrade V2.0
## Introduction
This is an aluminum frame conversion for the Prusa i3 MK2, MK2s, MK2.5 and MK3.
Josef PRŮŠA has created n
...Plusumerous of incredible 3D printers and its latest Prusa i3 MK3 is capable of very impressive print quality for a very low price. A huge thanks to him and all its team!
One of the down point of the Prusa i3 MK2 and MK3 is the rigidity of the frame. A very good project has solved those problems by using 3030 extrusion aluminum : Prusa 3030 Haribo Edition. So why another conversion build? Check the next section ;)
## 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](half_upgrade/) : similar to MK3 and cheaper
* [Full upgrade](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 and customisation than T-Slot
* Open source with powerful community
* Easy to square and build
* Worldwide shipping plus several other shops selling these parts
* Other type of aluminum extrusions can be supported thanks to parametric design (check Fusion 360 files)
* 3D printed parts designed using advanced techniques like selective infill, clean vertical holes, sharp angle...
* Open source by providing STL, STEP and Autodesk Fusion 360 files
## Full And Half upgrades
The Prusa i3 Bear upgrade is proposed in two versions: full or half upgrade.
* **Half upgrade** : upgrade your MK2/MK2s/MK2.5 frame to MK3 type
* **Full upgrade** : has a redesigned and stronger Z axis for all MK2 and MK3 printers but is more expensive
Here is a comparison table to help you choose :
| | Half Upgrade | Full Upgrade |
|-|:------------:|:------------:|
| Compatibility | MK2(s) and MK2.5 | MK2(s), MK2.5 and MK3 |
| Y axis rigidity | ♥ ♥ ♥ ♥ ♥ | ♥ ♥ ♥ ♥ ♥ |
| Z axis rigidity | ♥ ♥ ♥ | ♥ ♥ ♥ ♥ ♥ |
| Noise level | ♥ ♥ ♥ ♥ | ♥ ♥ ♥ ♥ |
| Customisation | ♥ ♥ ♥ | ♥ ♥ ♥ ♥ ♥ |
| Material cost | $ | $ $ |
| Number of V-Slots to cut | 6 (4 different lengths) | 7 (4 different lengths) |
| Number of V-Slots to tap | 4 | 0 |
| Can I place the printer inside an<br>enclosure and PSU outside? | No, PSU rigidify the Z frame | Yes |
| Capability to increase Z axis height?<br>(need customisation) | No | Yes |
_ _
Half upgrade use the same v-slots and printed part for MK2(s) and MK2.5. However, the full upgrade has 3 different versions, one for MK2(s), one for MK2.5 and another one for MK3.
Several printed parts are shared b
