2dNhtly Builds. Nhtly Builds are the bleeding edge versions of Pencil2D which have the most recent fixes and features. Find them on our Nhtly Build download page.. OlderUse our fast and free image to STL on tool to convert your PNG and JPG 2D hehtmap images or logo into 3D STL (Standard Triangle Language) meshmodel files suitable for printing with a 3D printer, CNC machining or