Additive Engineering for Additive Manufacture and 3D Printing. Mackart Additive has the experience and expertise to take your idea, your concept or even your finished design to reality with the power of Additive Manufacture and 3D Printing. Mackart has in house 3D printing capability covering FDM, CFF, FFF, SLA and Polyjet with engineering and prototyping materials available. We work alongside your team to add value and solutions throughout project lifecycles.