Is it possible to create an intermediate CA with lets encrypt for personal use?
No. If you need a CA for personal use, it is best to create one from scratch and import it into any computers you want to use with it.
By “for personal use” I meant my own CA, but certs to be used on my websites.
it would still be no as if they did every criminal wanting to create their own certs for http://facebook /google etc would be getting thier own trusted intermediate CA
and letsencrypt would be removed from most browsers list of trusted CAs
(as thats the sort of thing a trusted CA dosnt do)
what I expected, but you never know…