Simplify3D User Forum

I have had this happen a few times now.... I power up the printer (using Azteegv5rev3) and wait until I hear the PC find the SD card and populate it in explorer's window. I then hit the connect button (com3 showing by default) and it fails to connect. I hit refresh button on the ports and try connect again and this time it connects but immediately sends the effector down to the bed surface.. I haven't allowed it to actually get to the bed as I am afraid it will just keep going and crash into the glass so I kill the power before it gets there. After powering the printer back up, waiting for the PC to see the SD card (to ensure the PC has made the connection to the printer) then hitting connect, it seems to work fine.. This happens 40-50% of the time during the first attempt to connect after powering up the printer. Has anyone else seen this behaviour?

Well you can watch the communication log to see what commands are sent. I don't think there's any movement commands sent by default, but maybe the firmware has some hard-coded startup routine (I've seen several printers that did this)