I recommend using the supports I included. The origin is set the same as the model (use supports marked "square" for the tray with ends marked "square") so that you can use the "Join" feature of your slicer. You could also use your slicer to mark the supports as supports but they may be slightly weaker that way, and they are small so there isn't much of an advantage to that.
See my 196mm remix to fit certain slightly larger 7-piece dice sets.
The author remixed this model.
Differences of the remix compared to the original
- The pivot point is now the same on both sides so that both trays work properly (with changes to arms described below to fit better).
- The catch (that retains the trays when folded) is now the same on both sides so that both work properly.
- The arms of the trays...
- ...have a square end (plain version still included but optional), and the shaft width is even, which I think fits the aesthetic better.
- ...now have built-in supports (optional, but they seem to work better than PrusaSlicer or Cura supports).
- ...no longer hit the tower before opening all the way (due to hole changes above, and a different bottom to the arms).
- ...are now flat so they look better. There was no point in being wider except to house the old flexible pins which are not present in this version.
- ...have cleaner mesh characteristics and no longer have "zero faces" (tiny polygons which are boolean artifacts in this case. Some other issues still remain)
- The pegs are stepped, so they fit tightly in the tray's holes and loosely in the tower for easy movement.
- There is also a version of the tray included that has print-in-place (permanent) pegs.
- Various parts are now have a more even appearance (equal wall widths, etc.).
- The battlements are several times thicker so they don't break off easily.
- I also made battlements available as a separate model in case you already printed the old one (Break off your old battlements and glue the new one on or weld it with a 3D pen).