I made some changes to my MPCNC, found what was causing me issues after a winter hibernation (belts had become much looser on one side than the other), upped my voltage from 12V to 24V, and upped my max Z speed to ~30mm/s.
In ~6-7 hours (6% stepover on 1/8" inch ballnose bit) I turned this:
[attachment file=32552]
Into this:
[attachment file=32553]
Used a cheap 6mm bit (10 for $10) to rough, then a cheap 1/8" ball nose (10 for $10) for finish pass.
I used Vectric Aspire, but for just 3D models their Cut3D is cheaper. I made some money selling signs made out of Extira (and have been toying with making my own 16lb HDU - I bought the chemicals from USComposites, but was using it up too fast when I tried using it at 70 degrees. It says for best results to only use when outside temperature is 80+F since you have to have a lot of ventilation), so software/hardware becomes business expenses and easier to justify.