This add-on changes any case to a 90 degree corner style case. Cost increase is due to the additional material needed to print the larger corner pieces.
This replaces the standard corners with 90 degree corners. This is not a stand alone item.
(16) pieces change to 90 degree.
Please be advised the theme corners are NOT currently compatible with 90 degree corners. The only pieces from themes that are usable with 90 degree corners are the straight border pieces around the front door.