here are some pictures and videos of 3d printing that i've done...
the first layer is always done slowly so the plastic sticks to the glass. If the first layer is not done good the whole print can come off before it finished printing and the model is garbage then. So if the first layer is no done good the best option is to restart the print again.
here's a short video during the first layer being printed.
the model is about half finished at this point.
3d printing is an awesome invention it gives everyone the power to make just about anything they can imagine into a real physical object. It takes some practice to be able to design your own models but there are tons of free models ready to go online that can be downloaded for free.
Take care talk to you next time.