Mounts on metal frame of Prusa i3 rework to cool Ramps board. The 12V 60mm fan is held on with wire ties-- a requirement for 3D printers. The whole thing is attached to the frame with another wire tie, yes!! Other mounts weren't as beefy as this and didn't feel like they'd hold up. There is room between the Ramps board and the fan for all the wires to be routed up or down the frame. But don't blame me if you don't pay attention to the possibility of wires touching the fan and wrecking something. I only print ABS so the Ramps fan and hot end fan are both tied in to port D9. You may have to enable the fan in Marlin. Beware! There is a big old bridge at the end of the print. I printed mine with a .3mm nozzle and 1.75mm ABS. The first few strands across the bridge didn't make it but eventually it was successful. Is there nothing more 3D than being 4 hours into a print job and closely watching/hoping for the last 10 minutes to not wreck the entire print job? I used a 3D printer. To make more parts. For a 3D printer. SMH