I’ve had the Helor 106 for a year or so now and it’s a great solid grinder. Much prefer the flavour profile for filter to that of the Niche but that could be down to burr rpm not size. Niche at 330 v 20 on the Helor. Tastes a cleaner cup. Not as much difference compared to the Comandante tbh.
I’m just carrying out the mod to use 83mm conical in the Helor. These are the Mazzer burrs not the Italmill ones in the Malwani. I’ve done a revised design compare to the one I saw on YouTube as his files only have 9 magnets, mine has 12 on the cup, plus did not like how the outer burr attaches. I’ve inserted an embedded hex nut in the print so it’s solid and secure. Version 2 will use an embedded square nut as this will resist twisting even more although the hex shows no sign of an issue.
Should be interesting to taste 83mm conical running at really low rpms - I know the marketing blurb for the Weber Key sells it lower rpm as a positive - we’ll see