Mk2 to Mk2.5s upgrade without the mk2s kit  

RE: Mk2 to Mk2.5s upgrade without the mk2s kit

Heres also the files im planning to print out of PC or petg but dont want to spend the time, filament to print everything and pull it apart to realize im missing something needed from the mk2s upgrade

https://www.printables.com/model/88638-mk2s-to-mk25s-upgrade-printable-parts/files

RE:

you don't need the Mk2S Upgrade in order to go to mk2.5

Ideally the Fan Shroud should be ASA or ABS, or another high temperature filament!

Don't forget the endstop block... it is needed to operate the X Axis end stop switch, but people often forget about it!
regards Joan

RE: Mk2 to Mk2.5s upgrade without the mk2s kit

Thanks for the quick response Joan! That helps so im assuming the mk2s's bearings and smooth rods are the same size. I know i need to buy 9 ubolts from prusa to assemble and i was thinking about getting the smooth rods but seems they're the same as the old ones haha.

If im already ordering the Ubolts is there anything else i should add to the order to update or upgrade the mk2?

I have a roll of polymax PC so i'll print the fan shroud from that but i was also thinking of printing everything else in PC so they dont creep like petg does in a heated enclosure.

RE: Mk2 to Mk2.5s upgrade without the mk2s kit

Also you said you dont need to upgrade to mk2 first, but is there any advantages to doing the mk2s. I know they dont sell the kit anymore but if im not mistaken its just the smooth rods, u bolts and bearings that they still sell here right?

https://www.prusa3d.com/category/mk2-s-spare-parts/

RE: Mk2 to Mk2.5s upgrade without the mk2s kit

Hi Garrett

Prusa didn't recommend lubricating your smooth rods  and bearings, during assembly (Now they supply grease and a grease applicator)
If your Smooth rods and bearings are loose / worn / scratched, thee is a benefit in changing them 

I Lubricated mine during the build and maybe 6 years later they are still good. 

As far as the U Bolts are concerned, I Bought some, but never fitted them, a number of people who did fit them, over tightened them and damaged the bearings...
I printed bearing retainers and used them instead. 

the cable ties work but bearing retainers remove the chance of loose ties...

 regards Joan

RE: Mk2 to Mk2.5s upgrade without the mk2s kit

NINE U Bolts???

Are you upgrading 3 printers?

you only need three U bolts for the Y Axis...     X and z axis use printed bearing retainers.

Joan

RE: Mk2 to Mk2.5s upgrade without the mk2s kit

I am only upgrading 1 printer haha, i was thinking the x carriage needed u bolts but i guess not. the x axis seems good but the y axis seems not good on my mk2.

The y axis bearings make alot of noise think thats a bad sign but i never lubricated any bearings.

Did you print the bearing retainers for the y axis too or just on the Z and X axis? Also im not sure if the bearing reatiners for the X and Z are a file that comes with the prusa stl files or is there a different spot that there at? I appreciate the advice you've been very helpful

RE: Mk2 to Mk2.5s upgrade without the mk2s kit

Is this the y axis bearing reatiner you swapped the u bolts out for?

https://www.printables.com/model/681260

RE: Mk2 to Mk2.5s upgrade without the mk2s kit

No, those are not the actual ones that I used, however they should do the job for you. 

regards Joan