Very cool looking arm! Was it just to play around with or have you implemented it into another project in some way?

Nope, it was a Christmas present last year to my son (then 4), for him to play around with. Really cool, but no sensors or end-stops, so not something that can be used for any accuracy. It's a pretty open design, so maybe I'll hack something onto it in 2014, after the Printrbot is together.

My kit was missing 2x M3x16 bolts. There was a similar comment on the assembly instructions, so I bet someone made a batch of hardware bags with some mess-ups.

You had me worried, so I just went and counted every single nut/bolt (my hands now smell like bearing oil). All there, with a handful of extras thrown in of many of the small parts. I guess they were worried about QA, so they started adding extras.

Also, if you have a screwdriver type hex driver (instead of an "L" allen key), it would make assembly a lot easier.

Aha! I was actually going to order a nice allen-wrench set (been looking for an excuse), but while I had the hardware bags open, I checked the tools I've got, and yep, I've got some torx bits that aren't intended for M2/M3 bolts, but do the job quite nicely, and fit into my ratchet-screwdriver.

ties, which I used for wire management other than they had shown

I've got an issue of "Servo" magazine (bought specifically because they assembled a few 3D printers, including the Simple), and they recommend using a split loom cable to contain all the wires. I might have to run by the local hardware shop to see if I can get a short length (won't need much).

Let me know how yours is going with test prints. I'll be at that point in about a week.