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Picture of Acrylic Shield Holder
When you have a project on display and need to keep little fingers out, an acrylic shield is useful.  This project uses 3D printed brackets to mount the shield to a plywood base.

Parts:
Acrylic  I used 1/4 inch thick, 2 sheets 18 inches by 48 inches and 2 sheets 18 inches by 36 inches   estreetplastics.com
6/32 by 1 inch machine screws
3D printed brackets--design and print files here:
http://www.thingiverse.com/thing:102023

Building this in a "U" shape is critical for strength. The brackets hold everything together and secure the acrylic to the plywood base.

Step 1:

Picture of
shield1.jpg
Mount the base pieces to the plywood and insert the acrylic into the slots.  Do not push or lean on the acrylic at this point or you risk splitting the bracket or the acrylic.