Generates one adapter - print two of it to be symmetric Thanks to Emanresu. Original design and code by emanresu (http://www.thingiverse.com/Emanresu) Customizable Spool Adapter http://www.thingiverse.com/thing:82800 I optimzed/reduced the used Material on the bigger diameter. I used it to adapt the Axle of Spool Holder for small build plates http://www.thingiverse.com/thing:224853 to Spool for Laywoo-D3 3mm and 1.75mm http://www.thingiverse.com/thing:39564 custom_spool_axle_adapter_19_27_32_20_8.stl ist the Version with Parameters / [Diameter] / // diameter of the axle hole [mm] axle_hole_diameter = 19; // diameter of spool hole [mm] spool_hole_diameter = 27; // diameter of spool hole [mm] adapter_diameter = spool_hole_diameter + 5; / [Lengts] / // length of spacer [mm] (useful for centering a spool) spacer_length = 20; // distance bearing sticks into spool hole [mm] spool_hole_depth = 8;