This thing was made with Tinkercad. Edit it online https://www.tinkercad.com/things/bzzsxugogPS
If you are running a 40mm parts cooling fan mounted on the front of your hot end, you can print this to mount a 15mm x 20mm x 50mm blower fan on the existing fan shroud.
Printed in PETG for strenght. For PLA print in 0.1mm.
There is a 4mm slotted hole if your fan doesn't click into place like mine did, so a bolt can be added to secure the fan to the adaptor.