View source for MIT Manufacturing Course 2.0008

You can enroll for audit for free and have access to all materials while
the course is running. You can easily (and officially) download all
videos and slides during the course if you want.

If you take the certificate option for ~$150, the course is archived for
you and always accessible. (No longer possible at this point, you have
to wait until they re-run the course.)

Not sure if you can still enroll at this point:
https://courses.edx.org/courses/course-v1:MITx+2.854.1x+2T2020/course/


And, also, OCW is a free resource for sure (but this course has no video
coverage):
https://ocw.mit.edu/courses/mechanical-engineering/2-008-design-and-manufacturing-ii-spring-2004/index.htm
Generally, OCW is a treasure-trove, but can be a huge time-sink! :)