Original Prusa i3 MK3/S to MK3S+ upgrade kit

Absolutely worth it

Although I procrastinated on this upgrade (as you have to print your own parts), I'm really glad I finally sat down and did it.

The most important upgrade here is the new extruder for sure. My biggest issue with the MK3S extruder was the fan shroud; my original one broke very early on, and new ones I printed myself would eventually fail and crash into prints. The shroud has to be printed with ASA, and I have no experience with the material.

Thankfully they include the ASA printed fan shroud with the kit! The rest of the parts are very straightforward to print, and they provide high quality PETG to ensure the parts are nice and strong.

Overall, this is a worthwhile purchase if you have a MK3/s. The included SuperPINDA provides a much vaster improvement on the MINI in comparison, but it's still nice to have a temperature independent probe. Less zip ties and no more U-Bolts on the bed bearings is a plus in my book as well.

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Notes on MK3S to MK3S+ upgrade

I just upgraded my 2 MK3S machines (and 2 Mini’s) and wanted to point out some things that MK3S owners may find helpful while deciding on what to upgrade and what not to MK3S+ features. Obviously I’m just a user and Prusa’s recommendations always must be followed when in doubt. DO update to Super PINDA as well as 3.9.2 firmware. Note: MK3S+ Print files for plastic parts are now on Prusa website.
1) Extruder body and filament sensor body upgrades (x-axis): I really did not see a need to perform this upgrade on the entire extruder body since my filament sensor as well as extruder have no issues though I can clearly see how assembly would be easier and as per Prusa some filament path improvements. Your choice but in my experience not required. I’ve kept the parts printed and ready for when I service the extruder and then will swap then out. Back plate and cover are same as MK3S.
2) Extruder front plate and new fan shroud: I LOVE IT. And did this upgrade right away. I print my fan shrouds in Nylon but Prusa recommends ASA. Either ways, you will need just the front extruder cover and fan shroud for this upgrade. You will need to remove the two front facing screws of the Noctua, remove the Print fan, and open the two long screws holding the plate in place under the E motor. This is a really simple and quick upgrade. I did have issues aligning the old fan shroud perfectly level to the bed before tightening the print fan but wasn’t a problem really BUT this is MUCH better for sure. Perfectly aligns the fan shroud. I would recommend it.
3) Print bed smooth rod holders and new clips: I do not have the new clips but a new MK3S+ is on the way so I’m sure assembly will be simpler with the clips. I did print the smooth rod holders but haven’t really felt like installing them because as I said earlier and I think Prusa says the same thing…not needed if your printer is running fine so will install them when I open things up next to clean/service/grease next.
There may be a lot of other small things but I felt since we all want the latest, better to keep the functional and need in mind too. Hope you all enjoy using these printers as much as I do. Happy pinting.

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