One of the great things about 3D printing is you can print multiple parts that are printed interlocked in their proper spots so they come off the printer already assembled!
This past October, I tried my hand at "moving parts" to make a “Dial-O-Lantern” toy for my kids. The concept was a 3D printed Jack-O-Lantern with three sliding pieces that would allow you to “dial” and configure between 3 different sets of eyes, 3 sets of noses, and 3 sets of mouths-- a total of 27 different face combinations. The pumpkin printed completely assembled and has a removable lid so an LED light can be placed inside.
I modeled my pumpkin in Blender, which is free and open source. Since I do not own a 3D printer of my own, I had my pumpkin printed by Shapeways in their Strong & Flexible Plastics, the color orange of course! : )
In this Instructables article, I’ll go over the thought process behind some of my design decisions and then my modeling approach in Blender. Attached at the end is the final .STL file of my pumpkin which you can print for yourself. If you don’t have a printer or your printer isn’t capable of interlocking parts, you can also order one to be printed by Shapeways.
This model is licensed Creative Commons (With Attribution and No Commercial Use Without Permission)