Air pipe for the back fan of the K1.
It does not require any modification, it is stable and solid!
Simply disassemble the fan, insert the screws and screw back on.
You can change the direction of the fan when reassembling to have a second cooling fan for the models.
I inserted two rows with different tolerances for the screws, the offset can change depending on the material and the speed used.
If you need help send me a message.