I made this improved J-head specifically for these chinese delta clone printers. The J-head that comes with them is not great and gives only 1 place to attach a part cooling fan. The bad part is the attachment point is directly in line with 1 of the 2020 towers, so a large move towards that tower will cause the attachment to crash into the belt and ruin your print.
With this design, you get 2 part attachments for whatever you want to use (part cooling fans, z-probe, etc) and they protrude away from the three 2020 towers (the 3 empty sides of the printer). This way, the printer can make long moves and you dont have to worry about crashing into the drive belts. The attachment points are also lowered to give the rod joints plenty of clearance so they dont bind.
This should fit your standard kossel mini 6 screw effector like this:
I haven't personally tested it with the part above, but if you have something like it, it should work fine.
Also bear in mind, this is designed to fit the chinese clone hotend that came with my printer, so I cant guarantee the slot on the J-head will fit your hot end. I REALLY hate seeing a nice part on this site but have to wonder if it will fit my printer, and then finally find out after printing it that it doesnt fit. See the dimensions below and compare them to the diagrams to see if this will work for you.
I have a Youtube video of my printer with this part installed too:
All below measurements are in mm
Sintron Kossel Mini Delta (chinese clone)
Calipers, old included J-head, Fusion360, and several prototypes