Locking Egg with Key - Great for Easter Hunts and Geocaching!
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Watch this video for a demonstration and assembly instructions: https://youtu.be/GQLYFEvlZAI Please "like" this thing to help it rise in the search results. This locking Egg will be the highlight of your next Easter Egg hunt. There are three key combinations. (Coming soon.) Place keys and candy in the various eggs, lock them up, and hide them. Then give the hunters only one key. The idea is that they have to find the right match and unlock that to find the keys for the other eggs. This is also a fun way to hide a geocache, though you may want to place the egg in a plastic bag to avoid the elements. This should scale bigger with no problems, but it won't scale much smaller. The locking mechanism uses a hidden barrel cam to move a pin up and down. I tried 10 or so various locking methods before I settled on the barrel cam. Instructions: Slicing settings: 0.2mm layer height or shorter, 0.4mm nozzle or smaller, 15 percent infill or higher, see note below about Horizontal Expansion. 1. Slice and print LockingEgg_BarrelCam_1of2_RequiresSupports.stl. This part requires supports, but the other parts do not. In fact, supports will be very hard to clean off the other parts, so I recommend you slice them separate from this. Set supports to print for angles of 60 degrees and higher. I recommend a distance of 0.4mm between supports and structures. Because these are interlocking parts where a little filament expansion can result in overly-tight fits, you MUST use Cura's Horizontal Expansion or PrusaSlicer's XY Compensation (located in advance settings). I recommend you start with a setting of -0.1mm (that's negative 0.1mm), and if it's too loose, reprint with -0.05mm and so on. If it's still too tight, try -0.15 and so on.) 2. Slice and print LockingEgg_AllOtherParts_2of2_NoSupports.stl. I placed these parts in one stl to make it easier, but I will also provide the individual parts in separate STLs in the near future. Print without supports, or you'll have to do a lot of unnecessary support removal. See the note in Step 1 about Horizontal Expansion. You MUST use Horizontal Expansion to avoid an overly-tight fit. 3. Clean the supports off the Barrel Cam from Step 1 and lightly sand anything that looks like it may require it. 4. Follow this assembly video to see how to put together. You'll need some small needle nose pliers. https://www.youtube.com/watch?v=GQLYFEvlZAI I am also including the original Sketchup files. Feel free to remix this with surface skins and whatever you can dream up! This thing is a remix from my own simple threaded Easter Egg. I scaled this one up about 6 percent. You can download the original here: https://www.thingiverse.com/thing:4812640 Happy Easter!
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