This Left drive is made of 2 aluminium plates with plastic shims in between.
The alu plate is 4 mm stickness. Some holes (diam 2.5 mm) should be threaded for M3 screws.
The Alu plates are not extended on Y Aluminum Slot to allow some gantry flex during bed leveling.
The pulleys are hold in place by 5mm rectified stainless steel axle.
The author marked this model as their own original creation.