Gday,
This is a work in progress but at the moment i have one installed and working on my Makibox.

In short i was trying to stop the Y axis lagging. I found the Makibox opensource bitbucket (https://bitbucket.org/makible/5dprint-a6-3d-printer/) and the carriage on the bit bucket appeared to be a more recent revision than the one that shipped with the makibox. I also found a branch off the original by cassidy_s (https://bitbucket.org/cassidy_s/5dprint-a6-3d-printer-pom_bearing_inserts-default-screw/src/) this one had the correct threads for the X and Y axis.

I used eDrawings solidworks viewer to export to STL and then 123D to resize to correct sizes and clean some parts up.

These X and Y axis versions however have no tolerance. So after i printed them in PLA I used a lighter to help the bearings thread and the rigid Y rods to fit. It is very tight but it will bed in in time (approx 4 hours of heating up etc to get them to thread).

But end result is a far more rigid Y axis than before.

So feel free to have a look and try new things, if they work remix and let us all know about it :).