I have built 2 delta in this year, and I have design my own delta effector.
There is the openscad file in the download.
You can mount up to 3 40mm fan. One fanduct is open to cool down the hotendbody, the other 2 are close to send the airflow to the printed piece.
You can customize it with a little of effert.
I have uset it with cheap 3mm joint and with expensive igus joint. It works fine.
I have to integrate a probe mount to be complete.
Hope you like it :)
Printed it in PLA. No support.
No raft. Still working fine :)