a quick project for our art supplies. the idea was to have a stand for our markers and to be filled with something heavy so the markers could be removed. also we decided to glue the marker caps in place and pull out the pen portion only.
Support is not needed for a majority of the object but it will be needed for the butterfly. If it is possible to print up to a limited height then set it to about 11 mm. It will give you enough support for the butterfly but will stop the interior from having supports
NOTE: the hole diameter is set t 11.5 mm with a depth of 21 mm, this will need to be checked against your own markers.