Look into the concept of 'Chip Load'.
It refers to how much material a cutting tool bites off on each rotation. It is a product of the spindle RPM, the number of cutting flutes and the speed it is being moved through the material.
It is obvious that there is a maximum chip load, but there is also a minimum chip load where the cutter transitions from being a cutter to being a grinder.
Also don’t get sucked in with no-name Ali-express tooling. The name brand stuff works a LOT better and when you factor in wasted time and scrapped parts, it can work out cheaper.
When you are cutting aluminium, be aware that you must have some lube on the tool or else the chips will weld to the tool and it will break in a fraction of a second. Recutting chips can also cause this, so you need to clear chips either with vacuum or air or manually with a brush.
Lastly you should seriously look at fusion360. It’s free for you and the CAM is easy to learn and up with the best out there.
Yes - all of my very high-end carbide tools are lower cost than the various no-name tools I have tried. In some cases, a tool with 10x (or more) the purchase price is still lower cost. Cheap tools slow you down, scrap parts, and have to be replaced all the time. With that in mind, a beginner with a cheap machine tends to break tools more by accident or misuse rather than natural wear. Cheap machines also have big runout numbers on the spindle (regardless of manufacturer claims). Runout kills tools FAST.
F360 is a great option, not sure what the Carbide 3D machine requires. Many of these maker machines have a 'flavor' of G-code or some anomaly that makes it harder to program.
From their email, they said the rated accuracy is based on actual measurement of machined parts with only factory calibration, with fine user calibration it can be better.
I am very skeptical of the claim. It will also change considerably under loads. The system is inherently absent of rigidity and the acme nuts take up backlash with a spring.
Wishing there was one in my area to measure reality. Maybe even borrow a Renishaw ball bar to really paint a picture of its capability.