Magnetic fan mount holder

Another 40mm fan mount, this one magnetic. I stick this to the side of my Printrbot metal plus for additional cooling when needed. Printed using supports with support infill set to 22%. The normal object infill is set to 15%. The filament is Paramount 100M matte black. The magnets are these https://www.kjmagnetics.com/proddetail.asp?prod=R622CS-N The magnet bolts are flat head #4 x 3/8", the rest of the bolts are regular #6.