This is a fan / blower mount designed for a M Prime One printer with a V5 clone with 25mm (~ 24.8mm) cooler diameter and a volcano heatblock. I use a 0.6 mm nozzle/0.5mm layer height and the original fan simply wasn´t strong enough (and in the wrong position) to get decent results.
Can be used with the original probe holder or my design -> http://www.thingiverse.com/thing:1701457
If you mount it and it is too loose you can simply replace the original 40x40 fan with the spacer. Use the M3x20 screws used in the original M Prime One design to mount the spacer where the old fan was mounted. They have the exact right length to keep the blower fan mount in place ;)
The 5015 blower is very strong. You should do a PID autotune in Marlin to prevent "thermal runaway" errors at higher fan speeds.
FreeCAD source file included.
Parts list / BOM:
1 x Printed fan mount
1 x Printed spacer
1 x 12V 5015 Blower fan e. g. from Aliexpress
1 x 12V 4020 Blower fan e. g. from Aliexpress
7 x M3 x 20mm bolts e. g. from Aliexpress
7 x M3 nuts e. g. from Aliexpress