The portable espresso machine comes with a coffee grounds scooper. I say it’s more suitable as a tamper.
Where it gets tricky is if you want to use your own coffee grounds. Normally, you would use finely ground coffee for an espresso machine. However, if you add finely ground coffee to the Wacaco Espresso maker then coffee drips off the side and it doesn’t come out well.
There is a spring device inside the top cap. This is to add more pressure to the coarser coffee grounds, much like a pressurized portafilter does. You can remove it when you use finer coffee grounds. In my experience it didn’t make a difference. Either way it made a mess or dripped out from somewhere. (Read warning above)
It’s better using coarser grounds, which makes it weaker. It takes a little bit of practice to dial in the espresso with the Wacaco.
When I first started I grounded the coffee with a pour-over coarseness. It made the crema pale, wispy, and very little. The end result with regular coffee grounds was simply not good either. This was after 2 tries but it got a little better after each time.
Pictured here: Espresso shot with Sunbeam EM0480 grinder set on 11. Tamped very hard. Unpressurised portafilter. It started coming out in a solid stream at the 7th pump