Not sure if this is the right place to post this, but I'll happily (re)move it if it's not ok. I'm the unhappy owner of a Chinese CNC3018 machine. I know this is at the bottom of the low-end of machines, but given some space/weight limitations, it's the only thing I can use right now. Therefore, I'd want to get the most out of it and I hope a few upgrades might do the job. I should note I'm aiming to mill 1.5mm thick aluminium sheets - most of the time, I'm just looking at round holes and slots and some engraving. Ideally, I'd like to go up to 3mm if possible. Now, having used the machine a bit, I've concluded its biggest problems are related to the spindle (which lacks power and quickly loses speed) and the huge play it has on the Z axis (in part due to the shabby spindle holder and the flex in the X axis). I'd like to replace the whole X/Z carriage and I was looking at these: https://www.ebay.com/itm/Ball-Screw-...?&shqty=1#shId. They have both a 400mm X axis and a 60mm Z axis version that fit well together, even if I don't know exactly how I could fit the X axis to my machine - I'm thinking a pair of steel brackets should to the trick, assuming they can be attached on the back. Having that installed, I could get a bigger spindle, although I don't now how big should that be - maybe 1.5kW (or even 0.8kW if it's enough). I'm open to suggestions here. Also, I'd appreciate a thought on this endeavour. Is it worthwhile? Are there better alternatives keeping in mind these size/weight constraints?