This is a reinforcement for the Y-AXIS Rail of the ENDER 3. This may work on other printers, but this is not tested to fit anything except an ENDER 3. This is intended to stiffen the Y-Axis rail. This part can be added to either end of the Y-Axis Rail alone or used on both front and rear. This bracket should give the ENDER 3 similar Y- Axis stiffness to the Pro Model which uses the 4040 Y Rail instead of the 2040. This is printed in PTEG and originally sliced in CURA 3.6.0. UPDATE 10/08/2019 User minzukas found and repaired some errors caused by an incomplete or incorrect merge in THINGIVERSE. Thanks to minzukas for supplying a corrected STL file. I also corrected another merging error that I found after downloading minzukas' Repaired file.