Nice to hear! At the moment the spindle, if it has the right to be called that, is a 775 motor with a chuck attached to it. Which is good enough for circuit boards and wood. Perhaps aluminium is doable as well as long as the feed rate is kept slow enough.

Should milling steel ever be on the table I’ll make a larger machine and will use leadscrews on X and Y instead of belts and perhaps dual Z motors.

I’ve also designed the build around materials that were readily available such as the 18mm X rails. Apparently they’re quite obscure since they aren’t sold on typical Chinese webshops.