Hello all, thanks for reading. I'm in the process of designing a machine that will move a hall effect sensor in 3 dimensions through a magnetic field and record readings. Before I started the design however, I wanted to see if there would be huge problems in how I envision this machine. If I were to use medium sized dc or stepper motors ~30cm away from the test magnet and use aluminum or ss for the support structure, is this going to warp my magnetic field or cause too much noise? Would it be necessary to use as little metal as possible in this machine or move the motors as far away as possible? I basically want to design it so I'm dealing with as little noise as possible. I don't have many details on how machines like this operate so I'm mainly going off of how 3d printers function, I just don't want to make a huge mistake that will render the machine useless. Thanks for your time, I'd appreciate any input you guys have for me.