I am currently trying to design a new X-Axis for my 3D printer. It is designed to be compatible with the AM8 build as that is what my printer is based on.

Here is a video test of the axis: https://www.youtube.com/watch?v=dcin1eqA098

Here is a video of it running on my printer: https://youtu.be/QuQ35qA9fI4

You will need:

• 410mm 2020 Extrusion
• 350mm MGN12 Rail
• 2x Delrin lead nuts with a hole spacing of 19mm (like this https://bit.ly/37YAnXy)
• 1x Aluminium Belt Tensioner (like this https://www.amazon.co.uk/Aibecy-Synchronous-Straighten-Tensioner-Accessories/dp/B07TT362HX/ref=asc_df_B07TT362HX/)
• 3x M3x35 screws for the Titan Aero
• 2x M3x25 screws for the fan assembly
• 4x M3x10 (or 12) screws to secure the carriage to the MGN block
• 8x M3x8 for the belt clamp system and the X-Axis Motor
• 7x M4x16 for the left and right hand sides
• 7x M4 T-Nuts. (You can probably swap these two M4 parts for M3 if you wanted)

You can finely adjust the spacing between the leadscrews to perfectly match your printer too, hopefully 410 should be just the right size for most.

Update 29/01/2021:
I ran a little CFD simulation to check the flow of the duct, it seems alright. Not ideal. I have installed the new nozzle and running some tests. It seems good but it is hard to tell if it is better than the high flow nozzle V1.0
File: Duct2.1.stl

Update 25/01/2021:
I was having a little trouble printing this in ABS so I made a second version of the extruder mount with a tab on the Fan Mount that makes it easier to print. The quality is much better with this! With PLA however, I had no issue with the original one.
File: ExtruderMount_V2.stl

Update 23/01/2021:
There is a WIP file for a Duct V2.0 with cooling from two sides! I am also looking at reprinting this in ABS, mainly just the Extruder mount due to small deformations.
File: Duct2.0.stl

Update 22/02/2020:
Been putting this off a little too long, did a final test print and some modifications and I think it is ready to go!

Update 05/01/2020:
Added mounting for attaching the belt to the axis, also increased clearance for solid coupling on the lead screws to the axis can get closer to the bed.