Periscope
thingiverse
Kids Periscope with tube and connectors you can print out to any desired length. Need out mirror as per dimensions in attached drawing.
Download Model from thingiverse
With this file you will be able to print Periscope with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Periscope.