@GeoffSteer if at some point I decide to build another one from scratch, I will try the Gecko/LinuxCNC way and will be probably sending inquiries your way regarding config/hal files.
For the first one I decided to go plug-n-play on the controller (i.e. GRBL) cause the CNC learning curve is already steep enough (electronics, CAM, feeds/speeds, etc) for a new user.
The tap I used made ~25mm deep threads, so I picked M5x25mm screws.
Tip: the ISO 7380F screws have a tiny tapered shoulder between the head and the screw body, so in order to take advantage of the larger head you will need to countersink your plate holes by a hair.
I was about to write that you should be able to find them on either side of the Atlantic, but a quick googling only shows german, british and dutch stores. In case you cannot find them closer to you and shipping is too much, an alternative could be to use āplainā button head cap screws and add your own flanges.
You know, speaking as a guy in the US, where this thing is made and a bulk of them are sold, I really, REALLY wish that Inventables would have chosen Imperial fasteners. Itās a serious pain in the tail to get anything metric around here locally without special ordering, even stupid stuff like lock nuts are three times the price of SAE hardware, and only available in limited selection.
Yeah, itās just really obnoxious when you want to do something really simple, but canāt get a frigginā socket head cap screw the right length without an Amazon order!
@DanBrown
If it makes you feel any better, it is not common to find any ISO7380Fās or DIN6926ās or other specialized fasteners in stock in local hardware stores on this side of the Atlantic either. I always have trouble sourcing locally something that is too niche, too small or too big.
I do most of my hardware ordering online as well and sometimes shipping costs more than the part(s).
I live in a small town in northern Minnesota where the air is cold and the ears are blue and anything slightly āoutside the normā for and old farmer is hard to find.
All I can say is Ace is the place of the metric hardware, man!