I carefully adjusted the four printer feet so the bubble is perfectly centered in its round yellow level indicator, as stated in the Uniz quick start guide.

But in fact the printer is totally lopsided! Look at the pictures attached, using a real spirit level. Look at the slope of the resin in the tank. It’s not a printer anymore, it’s the Titanic! How can I successfully print if the platform itself is not a perfect taut plumb line?! More important: where does such twist come from? Steel screw? Metal plate? The whole printer? The little round bubble level itslef?