This is a modular X-Carriage for the "mini 3D printer" from 3Dtje. (https://www.thingiverse.com/thing:1023641).
In my case the X-Carriage had quiet some play due to in accuracy and because I really like modular x-carriages, I decided to design a new one.
With this you can mount every tool you wish, and change it without much effort.
I also designed a E3D mount for this carriage.
(Link will follow in some hours)
Parts you need: (With Aliexpress links)
6x M3 Brass insert nuts (http://bit.ly/2PT5XOU)
2x M2 20mm screws (http://bit.ly/2VMGNa9
2x M2 nuts (http://bit.ly/2YgfvGu)
3x Bushing (From your old carriage)
Insert the 6 M3 brass inserts in the 4.5mm holes. I prefer melting them in with a soldering Iron.
Insert the 2 M2 screws in the holes on the back.
Make a loop with the GT2 Belts and zip tie it. After that insert this loop in the hole on the side, and lock it in place with the M2 Bolt.
Insert the bushings and install the carriage on your mini 3D printer.
eSun 3D PLA
Rotate the part in your slicer 90°, so that the holes for the Bushings are facing down.