Doorstop
thingiverse
This thingamajig is a makeshift blockage device, but you'd be wise to craft something more substantial using a humble 2x4 piece of lumber and a trusty hacksaw.
Download Model from thingiverse
With this file you will be able to print Doorstop 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 Doorstop.