A cube with inset faces, designed to make a Photo Block Puzzle, described on my 3D Printed Photo Block Puzzle on Instructables. This design is also a handy example of how to create a hollow cube that has embossed figures or text on all 6 faces and requires no support.
See the Cura image to see how to orient the pieces for printing. Print each cube half with the diagonal side down. Print the bar with the chamfered side down.
I've successfully printed this cube in PLA at the Lulzbot Mini's Standard Resolution (0.25 mm layer height) and High Detail Resolution (0.18 mm height). At Standard Resolution the bar that holds the two halves of the cube together has a little more play in it. Both resolutions worked fine for me.
Strictly speaking, I'm using a Lulzbot Mini rather than a Mini 2.
Note that each half of the cube has a pair of slots in it. These slots will hold the bar that will keep the two halves in position while the glue sets.
Using E6000 Craft Glue - or whatever plastic glue you prefer - put a blob of glue in each of the four slots (two per half-cube). Also run a bead of glue along the two short edges of one of the half cube pieces.
Place the bar in the slots in one of the half cubes, then press the other half-cube's slots into the bar to form the full cube. Make sure the cube halves are aligned, then hold the halves together until the glue sets (about 30 seconds for E6000).
Once the glue has dried, if desired use a hobby knife to remove any imperfections or extra glue from the outside of the cube.
See the my Instructable for how to create a photo block puzzle from 6 of these cubes and 6 photo prints.
See the Fusion 360 file, BlockPuzzleCube.f3d, to see how I designed the cube. I started by defining a few User Parameters so I could easily change the size and thickness of the hollow cube, then created an indented square on each face of the cube.
To make the cube printable without supports, I Split the cube diagonally to create two tent-shaped halves. I then added a slot cutout (see the slotCutter object in the file) and a bar to fit into the slots. I created only a little clearance (about 0.25 mm) so the bar fits tightly to hold the halves in place while gluing.
If you want a different sized cube, for different size photos, simply open the .f3d file, select Modify / Change Parameters, and change the imageSide parameter. I chose the current value of 53 mm to nicely divide a 4 inch by 6 inch photo into 6 nearly-equal pieces 51 mm square, with a little room to allow for errors in marking and cutting the photos into squares.