Portafilter Dosing Kits for DF Series Grinders

I ordered this in it worked just fine except it's a raw 3D print, edges were sharp and occasionally I hit my knuckles and actually cut myself. Also my dosing funnel didn't fit snug on there.
All this to say I had to do a lot of finishing work. I used a metal file in ground back some of the plastic so my dosing funnel would fit on properly and I use some fine grit sandpaper and a file to grind down the edges so they are all smooth and didn't cut me. After that it's been fine but I agree with another review. It's not a finished product. It's just a cheap 3D print or nobody did any extra work to it. I'm still using it.

Original holder does not hold portafilter securely, but this add-on does. Very simple to swap out with just one screw. however, it is made out of rugged plastic that does not feel smooth. Would be a lot nicer if it was made of metal or higher quality plastic. For $20, it feels expensive for something that that should have been included in the original design of the grinder.

Totally worth it if you have a df and grind straight to the basket.

If you like to dose straight into the portafilter, it’s a must-have. Holds it hands-free and dampens the vibration of the dosing ring.

This addition to the grinder works great. It holds portafilter perfectly. Why didn’t the original work?
Does anyone do design reviews before releasing.
The original fails unless you hold it in place.