Nothing special here... just made the arms a bit wider so that it is more robust, as having printed the prior version with PLA, after about a month of use, one of the arms broke off. Hopefully, it'll be a bit stronger with a bit more plastic.. :-) ... Also the width of the wider arms goes as far as the footpads on bottom of the 15 button StreamDeck, and it actually helps to keep the gadget more secure in the mount. Hope it helps.