I’ve done it in SuiteCRM 8 using the old guide you’re probably referring to. Couple of things I ran into is:
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You have to make your module a “legacy module” for it to work. Google that on the forum, there are multiple posts on how to do that.
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There is an issue with the template parser in 8. It has the wrong URL (not the new structure for 8). See here: https://community.suitecrm.com/t/print-pdf-in-custom-module/76704/8