This a (mini) mechanical shadow-theatre that recreates a lava lamp, but using only lights and shadows ! The blobs of lights are slowly moving up across the paper screen, appearing, changing shape, merging... It is strangely mesmerizing. I made a short video to explain the design process: https://youtu.be/eRqHICl7BTc I have written some fairly detailled building instructions on Instructables: https://www.instructables.com/id/Shadow-Puppet-Lava-Lamp

List of Ingredients

You will need a few extra components (affiliate links):

an Ikea Jansjö USB Led light: https://www.amazon.com/Ikea-LED-USB-Lamp-Black/dp/B00R8H6VTM/ref=as_li_ss_tl?crid=353IHKNWQBY32&dchild=1&keywords=ikea+jansjo+led&qid=1600956378&refinements=p_85:2470955011&refresh=1&rnid=2470954011&rps=1&sprefix=ikea+jans,aps,212&sr=8-24&linkCode=sl1&tag=mojoptix-20&linkId=bc37b6f61b51987077378156df301fb8&language=en_US
a (silent) clock movement, with the minutes hand: https://www.amazon.com/Ikea-LED-USB-Lamp-Black/dp/B00R8H6VTM/ref=as_li_ss_tl?crid=353IHKNWQBY32&dchild=1&keywords=ikea+jansjo+led&qid=1600956378&refinements=p_85:2470955011&refresh=1&rnid=2470954011&rps=1&sprefix=ikea+jans,aps,212&sr=8-24&linkCode=sl1&tag=mojoptix-20&linkId=bc37b6f61b51987077378156df301fb8&language=en_US
2x ball bearings 688-2RS: https://www.amazon.com/Ikea-LED-USB-Lamp-Black/dp/B00R8H6VTM/ref=as_li_ss_tl?crid=353IHKNWQBY32&dchild=1&keywords=ikea+jansjo+led&qid=1600956378&refinements=p_85:2470955011&refresh=1&rnid=2470954011&rps=1&sprefix=ikea+jans,aps,212&sr=8-24&linkCode=sl1&tag=mojoptix-20&linkId=bc37b6f61b51987077378156df301fb8&language=en_US
5x M4 screws, 60mm long
2x M4 screws, 40mm long
2x M4 screws, 30mm long
1x M4 screw, 15mm long
4x M4 nuts
6x M4 wingnuts (can be replaced by regular M4 nuts)

3D printing

It should take about 24 hours and 150 grams of filament to 3D print everything.

Shadow-Puppet Lava Lamp

0.2mm layer, 2 walls, 15% infill