Printing from Cura not successful and failed prints

[vpswboces 0]

Hi Folks, 

 

I am supporting a friend of mine with their UM2.  We have two issues and 1 question:

 

1. When connected via USB and sending print jobs, there is no preheating automatically happening for bed and nozzle and then the bed does not rise to meet the nozzle to print.  The nozzle begins moving like its printing but its not preheated so no filament is coming out.  Do you have to manually tell the printer in Cura to preheat before hitting the print via usb button?

 

2. The second issue is more complicated.  If I print via SD card , all goes to plan except there is uneven flow of material and the print eventually fails in the first layer.  I dialed in the printer to use 1.75mm filament as the 2.85 was doing the same thing and was old and crumbling(they did not know about storing filament corectly when not in use).  How do I set the first layer for this printer?  I read about an SD card that was supposed to have a first layer file but I do not have that and can't find this on the website.  Is there also a way to dial in the extrusion.  I own a Prusa and the process is very different from the UMs.  

 

3. My question is related to the SD card.  Is there a limitation on the size of the card or the type of card the UM2 will read?  I used a Micro Sd inside an SD Card adapter that was only 8GB with one stl file on it.  Just hung when trying to read it.  Wasn't sure if this was a limitation I of the reader or not.

 

Thank you in advance!