Apart from your favourite filament flavours you will need 5 x 1 mm magnets and optionally a few drops of super glue, to hold everything in place.
Here are the magnets I have used, they can be bought pretty cheap on Amazon.

If you have differently sized magnets at home already and want to print this, feel free to leave a comment and I can edit the design to fit yours!
 

Printing instructions:

All parts except for “ice_cream_puttle” and “ice_cream_middle” can be printed with 0.2mm layer hight.
For the two exceptions you should use a layer hight of max. 0.15mm so you get two layers covering the magnets.
I also recommend printing those two with “thick bridges” enabled or else you might experience small holes where the magnets are because of the lack of layers covering them.

You might also want to give “Fuzzy skin” a shot, it really suits the ice cream and hides the seam.

Inserting the Magnets:

To insert the magnets you will want to add a pause to the print by heading to the layer view after slicing once and select the layer where the holes have been closed at already.
Then simply press on the + symbol and choose ”Add pause print (M601)" and slice again afterwards.

Please make sure to double check, that the magnets are orientated correctly so the parts don't repel each other after printing.

To not have anyone run into issue with clearance, the holes are quite oversized. 
For that reason I recommend securing the magnets in place with a drop of super glue especially if you don't use a brass nozzle.