Print starts above bed

[Access3Dservices]

Most 3D printers (including all of ours) have the Z-axis limit switch at Z-min, meaning when the bed hits the switch the nozzle is in contact with the bed. The Z-axis travel range then tells the printer how far down the bed can move. With the limit switch at Z-max instead the Z-axis travel range tells the printer how far up the bed can go before it hits the nozzle. If you were to move the Z-max switch down further without increasing the travel range you would put the nozzle out of the travel range so you'd be printing into air since the bed could not reach the nozzle as it's outside its defined range of travel. Hope that explains it more clearly.

As for lack of replies I've found this forum (and apparently most other 3D printing forums) are pretty dead which I was very surprised about. However, Facebook has some great 3D printing groups where you will get numerous intelligent responses often within minutes. I'd recommend the following Facebook groups plus a group specific to your printer:

3D Printing: https://www.facebook.com/profile.php?id=150438908406955
3D Print Club: https://www.facebook.com/profile.php?id=222414947887003
3D Printer DIY: https://www.facebook.com/profile.php?id=386484504786227

-Joe