Instructables
I made this sign for my Harley-riding father-in-law. It was pretty easy and inexpensive to make. The most costly supplies were the wood stain, pretreat, and top coat, but it only takes a few milliliters of each, so if you already own them you can produce one of these signs for just a few dollars each.

I made it at TechShop.


 
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Step 1: Supplies You'll Need

Picture of Supplies You'll Need
You will need the following supplies to make this sign:

1. A TechShop membership. Ok, not really a supply but most people don't have access to a laser cutter - if you do have a laser cutter you won't actually need a TechShop membership (but you should probably get one regardless).

2. Enough plywood to fit two copies of the sign you are planning to make. I used 1/8" birch plywood that I got at an art supply store. The plywood you get at art supply stores tends to be flatter, blemish-free, and will fit in a laser cutter. 

3. Wood staining and finishing supplies. I used:
     a.  Minwax Pre-Stain Wood Conditioner 
     b.  2 contrasting colors of Minwax Wood Finish (I used Pickled Oak and Ebony)
     c.  Minwax Fast-Drying Polyurethane 

4. Wood Glue

5. Sandpaper

6. Rags or a paintbrush for applying the conditioner, stain, and topcoat.