This is a simple edit of Kiesling's Ender 3 Tool Holder with the hole on the top rather than the backside.
Here's the OpenSCAD code I used to make this:
difference(){ import("E3_Tool_Holder_V3_Updated_5.26.19.stl"); translate([-1.5, 2.5, 2]) cube([16, 101, 100]);}translate([-1.5, 103.6, 0]) cube([16, 2, 92]);
E3ToolHolder.stl | 469.7KB |