3D Printed Storage Holder

Challenge: To create an original holder for white board markers for the school staff room.
Background: In the staff room we have a noticeboard.  As part of the notice board it requires whiteboard markers to operate it.  As the markers require something to hold them and to prevent teachers from removing the makers for their personal use.   There was already a specific hook in the staffroom however there was not a specific holder for the whiteboard makers.   This was an ideal task to create something to solve an issue, and while it was not personalized it was able to have a specific message for the purpose of the container, which reads "Do not remove from Staffroom".   The design needed to work in conjunction with the existing hook (which was a commercial MMM hook) hold the whiteboard markers securely.   This was designed by two students who have previously shown talent and creativity on a number projects using the 3D Printer.    This came as a design challenge by another member of staff.   Students were able to create this version which worked at the first attempt (see below for details about one part that did not).

Level of Difficulty: Medium - the design has a specific task to resolve a specific problem.    As a consequence there was little adaptability for the design - the hook had to be specific to fit the one that was there on the wall.   The inside of the holder needed to be specific in terms of depth and width to hold successfully whiteboard markers.   Obviously if these dimensions were not correct then the design would not meet its purpose.
Timeframe: Twelve hours - the design and size is all relative to the whiteboard makers and the purpose of the design.   Given that there was not much specific adaption possible this would be about right to complete the project.
Size: The print measured 110mm across and was 140mm high.   The storage part of the design was also reflected in this size.   This was all relative to the size of the whiteboard markers/hook.

Left: The part of the design that wasn't successful.   The internal storage part of the 3D Print as can be shown - there is clear failure of the printer to print as a solid line, without support or rafting.   This has happened from time to time and could have been solved by creating a support (internally for the design), however as it was the excess PLA was removed after the print had been completed and the holder served it purpose.
What we would do differently/Next steps for student: The main problem with the print was the internal support structure this could have been resolved by introducing either rafting, which then would have been removed after printing or creating a small support structure into the storage (for instance we could have divided the storage into two sections each holding a separate whiteboard maker).