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I've built a DIY 3D printer similar to Prusa i3. It does homing and bed leveling very well with a PNP Lj12a3_4_Z_BY sensor using G28 and G29.

Lj12a3_4_Z_BY

However, when I push the print button on Pronterface or Simplify3D, Z axis goes up about 20mm and starts printing in air. I can't figure out what is going wrong.

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If the cad model was imported from Solidworks into Simplify3D. Push "Center and Arrange" button to place the model in the middle of the Heat Bed. There might be a gap between the object and bed level that is hard to see.

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