I recently got a 3D printing pen. I tried freely drawing with it, its not worth it. I have found a good use for it, and that would be print repair. I have used my pen to save multiple failed prints. Check out this video I made to show how to repair cracks, and fuse layers back together.
I have had experience printing a a variety of print surfaces. I started with painters tape on an acrylic bed. I then started using glass and hairspray. I have also serviced multiple makerbots, white use makerbot's new build plate ( which is very cool because it is removable and flexible). On my CR-10 I used the stock glass bed along with hairspray. I noticed slight warping in the glass, so I purchased mirror tiles from Home Depot. I also purchased a LokBuild surface to atta