v90 too is my first cnc..
got my kit a couple weeks ago and parts were missing.. (tech support said they've checked everything before shipping, so likely the customs didn't place them back in the box)
finally got the missing parts box today, except only received half of what i need (2 x rail end bushings and 2 x base frame rail ends, i actually need 4 of each.)
i guess i just have to disassemble everything again and wait another week for the missing parts. this is very frustrating!
please Probotix, in the future, do include a "parts list" with your shipment so the customers can ensure everything is there before assembly.
as well, include a print version of the assembly instruction would be very helpful.
more details when i can finally assemble the thing..