The "Triple Rubik's Cube stand" (https://www.thingiverse.com/thing:1603523) allows one to display three cubes at once. Unfortunately, the model was too big for the build volume allowed on my resin printer. Here, the stand is redesigned into two identical pieces that are joined at a slit. Bevels were also added to the edges. Obviously, print two copies of the file to produce one functional stand.

Although it may be possible to sand or file the slit at an angle, such that they can be joined to form a stable 90 degree angle, I found it much easier to glue them securely into that position (see post-printing info).

Elegoo Mars

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After trying several different orientations for resin printing, I ended up favoring printing the pieces directly on the build plate, with the largest side flat on the plate. Elephant's foot was filed off along all bottom edges. A little extra filing was required in the slit until pieces could be joined cleanly.

To get the cleanest looking clear resin print, I sanded the pieces (from 400 grit to 3000 grit), and then applied a clear coat prior to gluing the pieces together. Take care to ensure that the junction is held at 90 degrees for gluing; otherwise the center cube will be tilted during display. I simply taped the pieces to the corner of a box before applying superglue to the junction.

The design is based on the cited "Triple Rubik's Cube stand." To allow printing reasonably sized stands on a resin printer, the stand was split into two identical halves that could be joined at a slit.