Summary Just a small case for the needle files to keep them together in the drawers, bags or wherever they might go. In the workshop or outside its essential to have all the tools organized.. Both parts of the case stay together by a friction fit, and we recommend printing in the orientation of the pictures. Scale or file to fit if necessary for your printer. The needle files we designed this for are 140 mm long, and have a 50 mm long handle. The diameter of the handles are 3mm but the base have 4 mm holes. This allows for shrinkage if printed in ABS or a little wiggle room for variations in handle diameter. For files 140 mm long, pick the 120 mm long top.