Infil 3D extruder spacer

This is a simple spacer for the excellent Infil3D extruder >>https://infill3d.com/home/48-75-geared-extruder-175mm.html

I have included some jpegs of my 3D model to show the issue the spacer resolves.

When i first fitted the extruder it worked fine from day1, but i found it hadn't enough clearance with the i3 frame ( Sintron Ebay Acrylic) and at a specific height threatened to hit one of the frame fixing screws so I adjusted my X endstop which in turn reduced the x travel. Not good
So i