Have an unsightly round hole that you would like to plug? (yeah, I get the jokes). This makes a plug to fill holes in counter tops, walls, etc. You can print with retention clips, a cap, or just a plug.
3d Solutech PLA
If you get a clean look from the first layer on the bed, I recommend placing the surface of the cap on the bed. If your printer finishes the top layer nicely, or you have the option to "iron" the last layer, print with the cap up. This will mean supports need to be cleaned up, but will give you the best looking part of the plug that is exposed for view!