I'm making an Ikea LACK tower to house my Makerfarm Pegasus 8 and MP Mini V2 and needed to make a flat spool holder for the top level. Instead of printing a whole new spool holder I designed a new bottom for the spool holder that comes with the Makerfarm Pegasus that allows it to sit flat on a table. I haven't used it yet since I haven't finished the tower, but its stable sitting on the table now. Took around 2.5 hours to print.
-The model will need to be rotated either 90deg or 270deg on x-axis before printing
-Printed on heated glass bed
-In order to get it to stick to glass, you will need to use an adhesion promoter. I used sugar water and it stuck almost perfectly and wasn't too hard to get off.
-I didn't use supports and the counter-bored holes turned out good enough to be functional, but the underside wasn't pretty. Its hidden from view so I didn't care enough to stop the print and add supports. If you want a perfect print, I recommend using supports under the counter-bored holes.