About this 3D model

http://bunkai.sakura.ne.jp/bunkai-wp/3d_printer/460/ ??????????????????????????????????? ??????????????????????? ??????????????????????????????????? PRN3D????????????????????????? It becomes the filter holder, which effectively remove dirt surface of the filament. Please use it by inserting the appropriate sponge form. It is for the hole type, there is a centering effect on the filter. You have created the PRN3D for, but it is the part that can be used for general purposes.