Hello Jef,
I hope everything is great with you.
As NXP, we do not provide official 3D step files, however, there are an un-official downloadable 3D step models in the NXP community, I checked and unfortunately there are no step model for the MPX2010GSX (Case 344F-01), however, there is a step model for a very similar case (Case 867F-03), which is the same size on the plastic part of the device, but the only difference is that this case is 6-pin instead of the 4-pin of the MPX2010GSX, in case this model can be useful you can find it in the following link:
https://community.nxp.com/docs/DOC-100737
I hope this can be useful.
Regards,
David