Supports needed. Paint on supports recommended.
Print with flat surface on bed.
I recommend full solid for more thermal resistance but It Not making a big difference.
Press the nuts into the hex-holes with a pin or pliers. Dont use a hammer! Since the material is thin it tends to break when using a hammer. They should slide in when pressed with moderate force while using a appropriate tool.
Update:
Added V2 with better stability, more clearance and better a fit on fan. Tested and reliable.
The author remixed this model.
Over all same parameters as the original.
I added three hexagonal holes so M3 nuts can be added. I experienced worn out threads after turned the screws two or three times. Everything is thight and firm now.
Long time period test's are pending yet. I recommend to use thermal resistent material at least 70°C. PETG should be fine.
Feedback Welcome since I its my first Remix.