This is a redwawn thing using the inspectacular but, most of the time, good enough working Tinkercad.
Tinkercad is based on simply 3D primitives (volumes) instead of the the stinky plane based other crap poeple make things from occasionally.
Just for those hwo can not do it themself.
If you ever have received a 3D model, give Netfab Basic (free of charge or even subscription crap) a try to fix it, if nessicary.
But sometimes it can not be fixed anyway.
Not printed jet, no CPU replacement by hand.
May try it later.