https://youtu.be/uL2P0k8Ls94

-Inspired by other magnetic modular x carriages, I present you this modular X-carriage for Tevo Tarantula 40x20mm rail.
-Simpler build and design, less material to print, less mass and vibrations, less room for errors.
-Extruder is mounted to plate via 6mm magnets.
-Magnets to be mounted and hot glued if needed
-51mm radial fan is mounted to the back via foam tape to eliminate noise and vibration.
-Radial fan's position also balances with the extruder.
-An external x axis limit switch plate is added to the left z axis carriage to activate the limit switch; the limit switch is mounted at the back of the front plate. (Refer to images)
-Belt to be mounted on the top 2 screws (left and right)

Disclaimer: I obtained dimensions from E3D official documentation/ drawings and a little bit of googling for BL touch, therefore dimensions may be inaccurate. I do not earn tips and money for designing these parts and I did waste my very own filaments during the prototyping process. Feel free to leave a note if the parts didn't work out, or better yet offer me the real dimensions!

Printed parts (in red):

1. Front plate
2. Back plate
3. Extruder mount
4. Fan duct
5. Limit switch plate
6. Laser mount
7. E3D mount
8. E3D mount flange
9. BL touch mount * mirror it to mount it on the left side

Additional parts (in purple):

1. 6mm magnets
2. Radial fan

Reused parts from printer (in green):

1. Screws
2. Left z axis plate
3. Extruder
4. 40x20mm rail
5. Wheels

License:
Creative Commons - Attribution - Non-Commercial - Share Alike

Update 20180221
Updated X-carriage front plate.STL
Uploaded BL Touch mount v1.STL
Uploaded E3D mount v1.STL
Uploaded E3d mount flange v1.STL
Uploaded laser mount v3.STL

Update 20180105
Final design, working prototype.
Updated X-carriage front plate.STL
Updated X-carriage back plate.STL
Updated X-carriage extruder mount.STL

Update 20171127
Updated X-carriage front plate.STL
Updated X-carriage back plate v2.STL

• Updated dimensions on belt-screw flange for better clearance from the rail.

Update 20171125
Uploaded laser mount v3.STL (for 2.5W laser engraver from eBay)

Update 20171112
New designs, no additional washers needed.
Uploaded Assembly Manual 3 (including plans)
Updated X-carriage front plate.STL
Updated X-carriage back plate v2.STL
Updated X-carriage extruder mount v2.STL
Updated fan duct V2.STL
Updated images

Update 20171105
Updated extruder mount dimension
Updated fan duct dimension