Hi @GBarua, the design files only exist as openSCAD or as the generated STLs. This is discussed in the thread Step Editable CAD.
In a large and open project we need a way to make the source code open and also to track and approve changes in an open way. Version control is very easy for any text-based file format, which is the major advantage of openSCAD. We can easily keep everything open and manage changes using open source methods. Once we have chosen openSCAD for those reasons, it builds our structures using a constructive solid geometry representation. This is fundamentally different from a boundary representation used by many other CAD programs. This unfortunately means that conversion between SCAD format and other file formats is not possible in general. There are some work-arounds that can work for some parts as in the thread Towards STEP components, but this is quite manual and a one-way conversion.
The full design files for the delta stage are at https://gitlab.com/openflexure/openflexure-delta-stage and the files for the block stage are at https://gitlab.com/openflexure/openflexure-block-stage.