15.1 Printer not extruding
  15.1.1 Printer not extruding at start of print
  15.1.2 Printer stops extruding in the middle of printing
 15.2 Flaws in printed objects
  15.2.1 Objects warping or coming loose or getting knocked loose of build plate
  15.2.2 Objects with poor layers or surface blemishes
  15.2.3 Object trouble at voids: drooping bridges or protrusions, “strings” through voids, bad edges near voids, “squished” skinny towers
  15.2.4 Object internal strength, or support integrity, or support material break-off issues
  15.2.5 Object dimensional accuracy
  15.2.6 Object design and model file problems
 15.3 Browser pop-up blocking and Tinkercad export