We have a lot of building supplies that you can use to build your ideas. For a full list, see your Lab Inventory. Some tools that are particularly interesting:
We have all sorts of wood to build with. Much of it comes in small pieces of balsa, or dowel rods. We also have extra wooden wheels and platforms.
Foam board is great for prototyping. It is relatively strong, and easy to cut. We have foam board in all shapes and sizes.
Also known as Plexi-Glass, acrylic sheets are very strong. Consider cutting acrylic sheets with the "scoring tool" or the rotary tool.
Glue, Tape, Staples, Velcro, Magnets, Zip Ties
We have lots of different kinds of adhesives. Rubber cement, Elmers Glue, Crazy Glue, Single-sided tape, Double-sided tape, Electrical tape, Staples, Velcro, Magnets, Zip Ties (lots of them), and more.
We have a lot of assorted random nuts, bolts, screws, etc.
Plasti-Dip is a paintable goo that dries as plastic. It is useful for adding grip to any surface. It does take a while to dry, but the heat gun helps accelerate that process.