I replaced the entire heat break, hot block and nozzle in one go. Installation is fairly straightforward. The instructions on the slice3d site are well detailed except for the last step on pid tuning, which from what i gathered PID tuning on the mini has been replaced with a custom prusa algorithm which can take into account different heat blocks, breaks, nozzle combinations so in the end i didn't have to do any pid tuning and it seems to be ok. I used the vanadium 0.4 nozzle and the surface finish is interesting, the stock nozzle seems to leave a more glossy looking finish whereas the vanadium nozzle leaves a more matte type finish. Overall surface quality was greatly improved, however very occasionally i would experience an outer perimeter which wouldn't properly adhere and would leave a gap, this was the worst when using the input shaper profiles. Regardless the hot block performs and looks amazing especially with the silicone boot.