You can find my last fan cover design for Dual Balance system but you can also use it for standard Dual extruder or with one extruder with the "origine file" type.
In this test i used the ultimaker original Dual firmware with my ultimaker 2 and my Dual Balance system in dual extruder mode. You can use 3 5v-fan and 2 12v-fan. The idea is to extract more heater with 2 5v-Fan in order to refresh more the head who have his 2 nozzles as you can see on the last picture (head 1 for 210 deg and head 2 for 27 deg and the room is at 22 deg) Thanks to Tinker team for their work on the firmware! https://community.ultimaker.com/topic/15939-tinker-firmware-introduction/?page=3&tab=comments
This design was thought with small fan 12v 25x25mm but can also be used with the standard fan 30x30mm
I have already produce 20 prototypes but the Dual Balance system only.
You can send to me a message and when there is 20 maker who have need this model i will manage the production. I will do my best to help Maker.
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