This is a mount for your Biqu H2 Extruder on a MGN12C Linear Rail (Sled) It is mounted with 4x M3x6mm, 2x M3x8, 2x M3x25 (one might need sanding) and the H2+Fan is mounted with 2x M3x20mm.
For connecting the GT2 Belt i use this https://www.thingiverse.com/thing:212873
For Parts cooling and BLTouch i used this: https://www.thingiverse.com/thing:4722930
Feel free to redesign or adapt it to your liking with the STEP-File
Assembly: Mount the bracket to your mgn12c rail with 4x M3x6mm screws
Mount the Biqu H2 extruder to it with 2x M3x20mm screws (clamp the bracket between fan and extruder)
Mount the fan duct to the extruder with 2x M3x8mm screws, mount the fan with the bltouch bracket with 2x M3x25 and you can continue with wiring.
Updated: angles on upper and lower angle for more ridgidety (is that correctly written?), better fit between the body and the backplate/rail mount, better belt fixation but still using the Belt Clip (can be either just screwed into the plastic or be used with a nut from atop)