This is a holder made for the corners of the flashforge creator pro. As you can see you can put whatever will fit into it. I wanted a way to hold my spray bottles and parts on the corner of my printer. The piece that holds the box up looks like an arrow and fits perfectly into the corner. THE ARROW WILL BE VERY FRAGILE UNLESS PRINTED PROPERLY. Due to the small size of the corner holes on the printer, you need to know that the arrow will be very fragile unless you print it with a high amount of infill or with a lot of outline/perimeter shells. I used 6 outlines/perimeter shells on my model, and the arrow, i.e., the part that holds the box up, is solid, and quite sturdy because of it. Also, if you don't use a filament that dissolves your pillars, be sure to use a support setting that will allow you to remove the pillars without damaging the arrow.