Each country has a schedule for import duties (normalized customs fees). It specifies the amount of duty on each type of product imported. In the US the schedule lists various products for which there is *NO* import duty.
Products with no duty are often goods that have no domestic equivalent. In other words, your importing them does not interfere with a domestic outfits business (are there any companies making coffee grinders in Canada?).
So, you might look into that.
When goods come into a country the customs office will just assess the standard rate *unless* the paperwork quotes the specific normalized customs code.
This is the USA version, your country will have its own.https://www.usitc.gov/tata/hts/index.htm
Somewhere in kitchen appliances might be the code that will get you the free pass on the customs. Then again it might not, but 5-10 minutes of research might save you some $$$.
As many of us in the US have stated there was no customs fee charged when we received our Niche. So, somewhere in that document, there is probably a code that states that there is no fee on kitchen appliances *that grind* (the doc does get down to very specific descriptions of what is the assessed duty and what is not).
Take the link, type coffee into the search box on the left and scroll through the results to see that flavored coffee is assessed 6.4% whereas most coffee has no fee.
But obviously, don't be confused, you have to look for your countries own doc, not the one above, which is linked to just to show you what you are looking for.
Addendum, - if you do find a code that excerpts a grinder from fees, then you would request that that code be shown prominently on the paperwork. No code shown usually means you get assessed as the customs employee is (usually) not going to look things up. This has happened to me when I have imported products that are duty-free, if the shipper left my code off the paperwork I got a fee assessed and to try and get it refunded is a lost cause.