Who is the default gateway for these VLANs, the MX or the MS? Regardless, if you don't have any ACL or firewall rule, communication is already allowed by default.
By the way, why is the printer port in Trunk mode? You can leave it in access mode.
I am not a Cisco Meraki employee. My suggestions are based on documentation of Meraki best practices and day-to-day experience.
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