This is a cell phone holder for the NordicTrack s22i spinning cycle. It fits between the weights under the monitor. It doesn't obstruct the fan. The weights can be removed and replaced without disturbing the phone.
I printed this in PLA at 0.20 mm using 2% infill.
I only used support under the open end of the cell phone cavity. This results in bridging. If that's undesirable to you add some supports for the remainder of the cavity.
The author hasn't provided the model origin yet.