This fan shroud it's designed to hang on the right of the Ultimaker Original Plus Aluminium.It won't fit the new aluminium fan cap (Ultimaker sent me a replacement and it's different, so check the photos to see if you have the same).The weird design it's because I wanted that was firmly attached and specially because I wanted to avoid hitting the X wood slidder blocks.On the stl and 3dm you can remove the area down the fan so you can change the holes for your fan. I think... I'm trying to improve this design. So expect it to change =)New Version V2.- Based on the original desings of the Metal Fan Cap from UMO+ that can be found on ultimaker github at https://github.com/Ultimaker/Ultimaker-Original-Plus/tree/master/1501%20Print%20Head%20Fancap%20Meta...- The 3dm files are much more editable so you can make your 'fan area' freestyle.- Cleaned the clamp area to be much smaller and much more tight to the aluminium. - I recommend to add a small strip of blue tape between the alu and the printed if you print it on pla, that will give enough air so it don't deforms.