Cooling tunnel for Anycubic kossel trigorilla board. The tunnel is high enough for those big heatsinks for TMC2208 & TMC2100. I fitted those big ones on mine, check the pictures. Fits a standard 5015 blower fan. I got mine from aliexpress. I used a 24V version connected to 12V, this is a lot quieter than the full blast from the 12V fan. So far this seems to provide adequate cooling.
The fan is mounted with 2 screws, and the tunnel is fixed to the trigorilla board with 1 screw through the hole in the corner of the board. No glue or other stuff needed, just some screws and nuts.
I got feedback that the fan opening interferes slightly with the thermistor connectors. They can still be attached, but they push against the tunnel without any clearance. I uploaded V2 of this tunnel, in this version the fan opening has a slight offset to the right so it doesn't interfere with the thermistor connectors anymore.
Anycubic Delta Linear Plus
0.2mm (cura adaptive layer height)
Printed upside down, otherwise you would have to generate supports for the whole thing.