Flat Back recommended at 4mm

Wall Hanger recommended at 6mm

Prints can be done using:

Single color printer by pausing once the base layer is done, usually layer 11 if using .2mm layer height and a 2mm base height. Then Manually changing to a different color before continuing the print. With many slicers you can add the pause after slicing first, right clicking the layer bar on the right at the exact layer you want the color change to occur, this should bring up a submenu with a pause option.

Multicolor AMS: Colors can be hand painted to desired colors using the paint option in your slicer with the merged version or loading both the bottom and tops and assigning 1 color to each part before merging the files.

Dual Extruders: Load both the top and bottom files. Assign 1 extruder to each part and stack the top part on top of the bottom. Please ensure the parts are touching. So, if my base is 2mm high, I the Z on the top part to 2mm. No need to merge the files or use a prime tower.