Necro Battle Area: texture only

Remixed the Necro Battle Area floor for printing 13,4mm x 13,4mm with a 0,8mm nozzle:

increased the size of small features
moved the holes away from the borders
made the holes shallower in order to enhance first layer adhesion
added supports to keep the central grill in place

Printing just the texture speeds the process dramatically, and allows easier customization creating sceneries. Ironing of the upper layer is recommended.