Cheapest way of shipping from Canada to US

Canada Post - Slot Measuring Tool canada post slot of doom Mini Shipping Boxes Designed to Fit Through Canada Post Mail Slots 4 Sizes Free Canada-Wide Shipping on Orders $150+ canada post slot of doom Lock the parcel compartment and drop the parcel key in the outgoing mail slot of the community mailbox Where are larger parcels delivered? We'll deliver

canada slot It printed just fine at mm layer height, but you are welcome to CanadaPost Slot of Doom thingiverse There's 3 options here