Those grey plastic lumps are what will fail eventually.
Luckily for me I saw it coming and used the machine to make its own replacement parts somewhat.
A few suppliers offer upgrades to those parts and for the Z its often worth it as you will probably end up with more Z travel.
That extra Z travel can come in quite useful too.
If you have somebody who can machine HDPE or aluminium that would make great replacement parts.
If not and you are handy (and accurate) with wood then a suitable hardwood makes just as good a replacement.
My spare parts came from a hardwood skid and I used the machine to do most of the work but simplified that "U" shaped bit to just a block that carries the bearings and lead screw. Then added two right angle plates I found at the hardware store to carry the rest of the assembly.
But see all those empty T slots on the side that just beg for something to be mounted like a nice piece of ply so you can move the power supply and electronics to a better area and give yourself room to add some extra controls and gadgets.
Also acts as a guard sort of to keep a lot of the sawdust more inside the machine.
Mine was a 3025 with a 50mm Z now its a 3025 with 170 Z and a plethora of electronic bolt ons.
Once you have one in your hands then you will quickly see which bits could have been made better or what you need to add on.
BTW if you can be patient enough with waiting times for delivery then look at
Aliexpress or even Ebay as Amazon tends to be more expensive for this game all round. Even my tooling comes from Aliexpress.
For tooling try avoid dual flutes and go with 4 flute preferably without the hole in the end for coolant and if you can find them the ones with slightly offset cutting edges on the bottom.
I got some 4mm ones a while back and am amazed at how much deeper I can go for a pass and how much quicker too. Not broken one of those yet either...Rough out with end mills and finish off with a ball end.
Although on occasion I finish with 1.0 mm END mills but you have to be careful with those.
BTW despite my CNC background it was all mechanical and I never programmed them so all this was a learning curve for me.
Will throw a couple of pics up when I get a moment that may explain better than I do.
Bob.