Silhouette Alta 3D printer weld function Posted on 26th March 2019 1- Open Silhouette Alta software. Click on the right arrows to open up your saved designs, or upload your own design. 2- Upload your design. Use your design library or upload a second design. You can even use any of the shape tools. 3- Select the shape you would like to weld with and resize. 4- Move the design to overlap the other design. At least a part of each design need to touch to be able to weld. 5- Once the 2 designs are where you want to them to weld, click on the select all tool. 6- Click on the weld tool. The two designs are now joined together (welded) 7- When you go to the print screen the design is all as one not 2 separate files to print.