I bought my first SainSmart 3018 Prover in August 2020. I am a retired woodworker with 40 years of experience. I need a new challenge in my life. I like the car but I had a little problem with the Z axis. I contacted support about the issue I was having. They immediately sent me a new part. I had a few problems, probably my fault, but "George" was very understanding and helpful. We upgraded the extension to an A 3040 machine and added a Z-axis upgrade to accommodate a 300w spindle motor. I've tried cheap 500w motors but had RFI issues but George saved the day. Now I just need more time. The support I received was fantastic. H. WoodWeatherford, Texas.