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I have had my finder for about 8 months now and have printed over 1500 hours on it. It was a store return and the only issue I have had was clogging due to ambient temperature. 2kg (about 4 pounds) seems fairly light and unlikely to warp a pair of steef rods. I could see a possibility of driving the print head into the bed causing a minor warpage but, even that is unlikely with the springs under the platform. Show me some more picture of your machine with your gauge so I can see the issue.