Using the provided fan bracket, my 50mm fan was very, very, very close to the platform, regularly (whenever printing larger objects) knocking off the paper clips that hold the glass plate to the platform and also sometimes knocking against the printed object which is a bad thing. So I decided I have the need for a modified one. I do not know if others do have the same problem but here it is. Should be printed in ABS if you want to use it when printing ABS because PLA part may get floppy when the heated bed gets above about 80°C.