I designed this part to mount a Chimera Hotend on the Geetech A20M.
I do not have the official E3D Chimera but a clone from DFORCE but the sizes are the same (I used the blueprint from E3D to design the mount).
It should be compatible with the other Geeetech printer like A20, A10 & A10M.
You will need a radial fan for the cooling.
It provides support for a BLTouch or equivalent.
I prefer the Chimera (2 In - 2 Out) vs the default A20M hotend (2 In - 1 Out) because I print PLA + PVA support.
You need to print 2 times the fan duct (ie 1 per nozzle) and glue them below the mount.
It allows to re-print only this part if it melted or broke.
Feel free to ask question or comments!
Update V2: I push a V2 version with a stronger support for the BLTouch that now use nuts and stronger fan ducts to prevent melting