user74203: Is it possible for a Trezor or Trezor T to connect with and directly interface with a printer? The Mycelium Entropy device is very useful to print paper wallets while minimizing MITM attacks. I'd like the Trezor to do the same.

user19033: It is a feature that this is not possible. You do not want to use a printer to print paper wallets as this is highly insecure.
Printers have a track record of having low security - so people can hack the printers - wait for it to print something that looks like a private key and send them home(not yours).
Also some printers have build-in hard drives that save every document printed - so there are also attack vectors where the printer does not need to be compromised before printing.
Also have a look here: https://events.ccc.de/congress/2011/Fahrplan/events/4780.en.html
https://media.ccc.de/v/28c3-4780-en-print_me_if_you_dare 

74203: <p>Is it possible for a Trezor or Trezor T to connect with and directly interface with a printer? The <a href="https://mycelium.com/mycelium-entropy.html" rel="nofollow noreferrer">Mycelium Entropy</a> device is very useful to print paper wallets while minimizing MITM attacks. I'd like the Trezor to do the same.</p>
 19033: <p>It is a feature that this is not possible. You do not want to use a printer to print paper wallets as this is highly insecure.
Printers have a track record of having low security - so people can hack the printers - wait for it to print something that looks like a private key and send them home(not yours).
Also some printers have build-in hard drives that save every document printed - so there are also attack vectors where the printer does not need to be compromised before printing.
Also have a look here: <a href="https://events.ccc.de/congress/2011/Fahrplan/events/4780.en.html" rel="nofollow noreferrer">https://events.ccc.de/congress/2011/Fahrplan/events/4780.en.html</a>
<a href="https://media.ccc.de/v/28c3-4780-en-print_me_if_you_dare" rel="nofollow noreferrer">https://media.ccc.de/v/28c3-4780-en-print_me_if_you_dare</a> </p>
