A more generic version of my "V393 to V303 Button Cell Adapter" http://www.thingiverse.com/thing:8410The file is set up to create a simple crescent shaped V393 to V303 Button Cell Adapter but you can insert sizes for whatever button cells you have on hand into the user_variables section.Please note if the smaller battery is not as tall as the larger battery this holder will not work for top & bottom type contact holders as a thin layer of plastic will be in the way!Also... you can't use this script to adapt a large battery to fit into the space intended for a small one!