What Ironman said.
Even last year, my SD4 came with no instructions whatsoever. If I did not have a year's experience and this website I would have a very large, expensive paperweight.
The community here is the best place to go on the web to find some help troubleshooting your machine and getting going.
Having a small base and wide top can certainly cause your failure, especially with a tall piece. Try using a brim and going slower. Also, if you are over-extruding (which can be caused by many things) you might wind up with small bumps and ridges. As time goes on they can get big enough that the extruder actually hits them and knocks your print off--regardless of size or shape.
P.S.-Welcome to 3d printing. If you want a hobby that is expensive, frustrating, and disappointing you have come to the right place.
P.P.S.-Make sure your temperature is right. You might be too low if you are using ABS or too high if you are using PLA, either one could cause your printer to jam.
IronMan wrote:Welcome to the state of things in the Consumer 3D Printing Industry 
It's actually gotten a little better than it was when I started about 3 years ago...I bought one of the first SD2 models and when I unboxed it had to hunt down my own Arduino drivers; install Arduino, get the correct firmware online, and flash the control board. Then I started the task of dialing the printer in. I would have expected a CD or a thumb drive packed in the carton to get me started...
If it wasn't for the likes of early experts in the field: IanJohnson, elmoret, Lawsy, wardjr (and many others too numerous to name) I would have been completely lost!
But enjoy your printer and you've come to the right place!
Solidoodle 4-Mostly stock running off headless Raspberry Pi with Octoprint