Robo 3D 25mm to 40mm fan adapter for hotend

thingiverse

I discovered that 25mm fans are significantly more challenging to obtain than their 40mm counterparts, and even when I was able to find one, it came with a much higher price tag. To work around this issue, I opted for using a 40mm fan instead of the harder-to-find 25mm model, which required me to develop an adapter to accommodate this change. It's worth noting that after mounting the adapter, you'll also need to replace the X endstop screw with one that is approximately 4mm longer in order to prevent the 40mm fan from colliding with the vertical Z rods.