1) A variety of welding fixing blocks can realize the installation and fixation of pen-type electric soldering irons; 2) High-precision, 300mm MGN12H linear guide provides a stable support to support all components and maintain working accuracy; 3) The overall structure is simple and easy to assemble; 4) Because the main parts are printable parts, the cost is low, which also reduces the cost of parts replacement. The appearance can also be modified and decorated according to the user's needs; 5) The tool uses an automatic telescopic cable to make the electric iron automatically rebound and play a protective role. It is simple, practical and easy to replace. Printed parts are not included in the package, you need to print them yourself.The for printed parts is below: https://.thingiverse.com/thing:6345072 Name: Stealth melt nut tool Scope of application: Suitable for pen-type soldering irons (for example: 877, Arrizo arz-c, Huanghua LT66, TS100/101, Pinecil, etc.), often used for -melt copper nuts printed on 3D printers or on plastics upper implant nut Main components: 3D printing kits, fasteners, linear guides, bearings, automatic telescopic lines Note: The soldering iron in the picture is not included Colour:black+silver+gold Material:Metal Package Contents: 1 x Heat Set Insert Tool Stealth Kit (No Soldering Iron) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.