In this Instructable I am 3d printing a 1x2x3 that I designed using 123D design, using my Ultimaker 3.

Step 1: Tools and Materials

Tools:
-3D printer, I used the ultimaker 3.
-Scissors
-Cheap paintbrush
-120 grit sandpaper

Materials:
-PLA or ABS filament
-Acetone
-The Kragle
-Rubik's cube stickers

Step 2: Printing

I printed this on my Ultimaker 3 using Gizmo Dorks black ABS filament.

The file can be found at the link below.
http://www.thingiverse.com/thing:2008465

Step 3: Cleaning Up

Step 1- Remove excess material using sharp scissors.

Step 2- Use sandpaper to smooth any sharp edges.

Step 4: Smoothing

use a cheap paintbrush to paint a player of acetone onto each piece and allow it to dry.

Step 5: Assembling

Step 1- Fit the corner pieces in the their places in the center pieces.

Step 2- Place the pin in the hole in the center piece with the hole through it.

Step 3- Apply super glue to the end of the pin.

Step 4- Put the pin in the hole in the other center piece.