These are Really excellent and it takes some time to realise how good they are.
Never mind about teething and alignment problems you'll get used to it , learning to be a CNC Engineer.
QCad-Cam is a good Computer Software program to use with these and good value at the bargain end, With Candle Operating System.
You have a Drilling, Engraving, Milling, Grinding ,Routing ,Computer controlled Factory here. (with the right bits). Like having Your Own Robot that makes things.
Try engraved Graphite moulds for metal casting.
These snowflake pattern aluminium extrusion profile models are in many ways more versatile that a pro because you can easily extend them in any direction with the same board, by buying more extrusion . They run well off a small 24v solar panel system too. the motor mount collar on my drill bench below is cast from a CNC milled mould .