Update 5: What to print before you disassemble the printer? See picture below
Update 4: Official manual to upgrade from MK2 to MK2S is out. See the link below
Update 3: MK2S upgrade kit will be shipped on 3rd of April. Link to eshop below
Update 2: Gcodes are finally here! Head below the text for link
Update: .stl files with new parts are here! More below this text!
Another important update for this week! Josef released MK2S
an updated version of MK2
For more information
head to Prusaprinters.org:
http://www.prusaprinters.org/original-p ... s-release/
As always recap from me:
MK2 is already one year old however, the current version shipped to you today is different from the initial release. There are countless printed parts updates and major improvements in printer’s firmware (10 versions so far).
Devs are working daily on all these updates and thanks to Prusa’s printing farms, where printers are working 24/7 in very hot environment, they have collected a lot of testing data including typical failures.
Improving printed parts and software wasn’t enough so the team improved some other parts as well, all those will be included on new printers and sold in an upgrade package to MK2 owners for about $50:
1) Better LM8UU mounting on Y axis
Using zip ties to hold bearings and Y carriage together resulted in wobbling of the whole bed. Print quality is affected just slightly, but the devs decided to change the mounting system and introduce U bolts to replace the zip ties. The “re-assembly” of the Y carriage is from my experience easy and the whole carriage with bed is acting like one solid block.
2) Better LM8UUs and smooth rods
Even though MK2 is quiet printer, there is always room for improvements. Upgraded MK2S is using better LM8UUs bearings combined with new version of smooth rods from hardened stainless steel. This enables very fluid movements and also decreases the noise. Some pre-assembled MK2 are already equipped with these parts, so check twice before you purchase the upgrade
3) Better P.I.N.D.A. probe mount
Current version of the probe mount is replaced by new version, which is much stronger in case of impact with printed object and also way easier for initial setup and calibration. The assembly manual is already updated, look for Chapter 5. Extruder and Chapter 9. Preflight check.Updated probe mount will be distributed in form of a g-code, get your ABS spools ready and as soon as there is link, I will update this thread.
Chapter 5: http://manual.prusa3d.com/Guide/5.+Extr ... /295#s4993
Chapter 9: http://manual.prusa3d.com/Guide/9.+Pref ... /302#s5155
4) Improved cable stress relief on extruder
Proper cable management is crucial to prevent many failures including broken wires. The most loaded part is behind the extruder, where in case of improper assembly can develop a “hinge” and overtime, while extruder moving across X-axis some cables can get wear down and broke. MK2S is stiffened in this spot by screw and special printed part, which apart from stiffening also raises the whole harness up in the air, so it is not touching the heatbed anymore.
5) Better electronics cover
Rambo (electronics) cover was the most commented part of the printer assembly. Therefore the whole mounting system was revised and believe me, the assembly is way easier now.
This is all for now, happy printing!
New parts can be downloaded from our GitHub https://github.com/prusa3d/Original-Pru ... nted-Parts
(To avoid issues with downloading, I suggest you to download the whole package)
Josef just released .gcodes with printable parts tweaked by our printing expert, heat up your printers! http://www.prusa3d.com/downloads/others ... gcodes.zip
Upgrade kit to MK2S is on the eshop, first batch leaves on 3rd of April! http://shop.prusa3d.com/en/printer-upgr ... grade.html
Official manual to help you step by step with upgrade from MK2 to MK2S is out, more here: http://prusa3d.dozuki.com/c/EN_upgrade
There are questions regarding printed parts for MK2S upgrade, so let's clear this out
To make your upgrade easier, we prepared G-code file including new X-carriage
(holding Extruder), Extruder body
(optional). Other parts of the printer changed as well, but the changes aren't so important for you to print them as well.