You can upgrade the frame to a Bear (much stiffer)
I have the bear installed. It makes zero difference in print quality. I would recommend sticking with the stock frame unless you want a particular look.
I have 3 MK3S printers. I almost bought a 4th over Xmas. I have one stock. One with a Mosquito Hotend. One with a Bondtech extruder. I would recommend sticking stock until you get used to it. If you must upgrade, the Mosquito is the best upgrade I have installed, but it was also the toughest to complete. I can now print just about any filament I want. The Mosquito prints at very high temperatures.
After trading a couple of PMs, I decided to order up my first upgrade for my Prusa - a Mosquito Magnum hot end.
You will love it. It is not a beginner mod, but if I can do it, anyone can.
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