RepRap G3D is a unique 3D printer construction which is based on an open source Prusai3 model.
The biggest improvement has been the removal of aluminum rods and replacing them with a stylish acrylic frame. This modification was not only performed to improve the aesthetics, but also has many practical features. It greatly improves the assembly process and provides better control of it. Just properly fit the assembled frames together and fasten them with a few screws.
More details here : https://gadgets3d.com/index.php?route=product/product&path=73&product_id=93