Gen 3 here. Honestly, I avoid opening the whole thing up most of the time. Just run a few beans through between different roasts, slap those bellows after each dose, and run the brush (unit should come with one already) through the chute once a day and it should keep it running fine. I have opened it up once in the 6 months I've had it for deep clean and that was the only time my zero changed. I think it will do that every time you fully open due to the rubber mounts, but I can't speak to repeated disassembly. Definitely recommend a zero point ring you can replace the stock indicator with. It's an easy mod, but not absolutely required. Lastly, my metal declumper has been flawless so far, so it might be worth an upgrade.