{"data":{"make":{"id":"1302028","created":"2023-11-26T12:44:47.688091+00:00","edited":null,"deleted":null,"isMake":true,"printer":{"id":"129","name":"Ender 3 Pro","__typename":"PrinterTypeType"},"parent":null,"author":{"id":"198328","handle":"robaki","verified":false,"dateVerified":null,"publicUsername":"robaki","avatarFilePath":"media/auth/avatars/70/70978f95-108a-4fb7-b3b2-1965dbd740eb.png","badgesProfileLevel":{"profileLevel":15,"__typename":"BadgesProfileLevelType"},"__typename":"UserType"},"images":[{"id":"1140332","filePath":"media/comment_images/71/fc8b83-5bdc-48c5-a481-42985bc7f016/img_2506.jpg","rotation":0,"__typename":"CommentImageType"}],"mentions":[{"id":"222604","handle":"Crab","__typename":"MentionListAssociationType"}],"text":"Awesome puzzle! Luckily, I had some spare 35mm pins from my RC car that I could use. Cutting these to the right length is my least favorite part, though. It's important to file down all the sharp edges at the ends of the pins to ensure they slide freely. Ideally, you should use a \u23006mm, h=5mm pin cut from smooth steel rod instead of heat inserts, as the latter can sometimes bite into the plastic or rotate and get stuck. A quick hit usually frees them. Watching someone try to solve it was a lot of fun. I think it's easier to solve without the ring. I'm excited to give it away as a Christmas present! Thanks, ##user-222604##!","rating":5,"likesCount":0,"liked":null,"membershipAgeMonths":null,"modelData":{"model":{"id":"659431","ratingAvg":"5.0000000000","ratingCount":1,"__typename":"PrintType"},"__typename":"ModelDataType"},"membershipTier":null,"__typename":"PrintCommentType","model":{"eligibleForNomination":false,"id":"659431","slug":"crab-conundrum-puzzle","name":"Crab Conundrum Puzzle","authorship":"author","club":false,"excludeCommercialUsage":false,"price":null,"eduProject":null,"ratingAvg":"5.0000000000","myRating":null,"ratingCount":1,"description":"

The Crab Conundrum is a 3D model of a puzzle that goes by many other names. Shaking it reveals pins that are contained inside. You must manipulate the puzzle in order to separate the two bars from the ring.

Update: Nov 26 '23: Ring is thinner on bottom to make spinning more reliable.

This puzzle requires the following hardware to be inserted during the printing process.

4 x M3-35mm pins (stainless or steel)
4 x M4B6L5 heat insets (any steel pin that is 6mm Dia and 5mm High is fine)

I printed this in PETG, but PLA is fine. I recommend 0.2mm layer, 3 perimeters, 3 top/bottom walls. I printed the ring with enough perimeters to make solid.

You insert the hardware just before the 20mm layer is printed. I used a filament change in PrusaSlicer and included the 3mf file of the bar so you can see where the printer will pause. If you have open access to the printer (MK3S), you can actually insert (carefully, and on-the-fly) the cylinders at about 18mm and then insert the pins at about 19.6mm) At the first filament change, you can first insert the two 6mmx5mm cylinders. Then insert the 2 metal rods. You can cut your own pins from a 150mm M3 rod. Cut long and file down to within 0.2mm of 35mm. You can purchase M3 35mm pins and the M4B6L5 heat insets from AliExpress cheaply.

The bars purposely fit a bit loose so that the puzzle solver can look between the joints to see the silver pins. If they spin the bars, then they should see the pins disappear across the joint. This gives a clue as to the solution.

There is a second filament change in the 3mf file if you wish to print the text in a contrasting color.

The video below shows how to set up and solve the puzzle.

","category":{"id":"33","path":[{"id":"30","name":"Toys & Games","nameEn":"Toys & Games","description":"Idle hands are the devil's playgrou\u00adnd. Make yourself and your kids busy with some cool 3D printed games. Print items for both indoor and outdoor play.","__typename":"CategoryType"},{"id":"33","name":"Puzzles & Brain-teasers","nameEn":"Puzzles & Brain-teasers","description":"Shake your brains and figure it out! Print and solve all these clever puzzles, Rubik's cube, Cryptex, or Maze cube. Become a maze-hero and torture your friends.","__typename":"CategoryType"}],"__typename":"CategoryType"},"modified":"2023-11-26T15:37:57.687152+00:00","firstPublish":"2023-11-25T20:35:59.729994+00:00","datePublished":"2023-11-26T15:37:57.671528+00:00","dateCreatedThingiverse":null,"nsfw":false,"aiGenerated":false,"politicalContent":false,"summary":"A great gift! Can you remove the bars from the ring?","likesCount":3,"makesCount":1,"liked":null,"printDuration":null,"numPieces":0,"weight":null,"nozzleDiameters":null,"usedMaterial":null,"layerHeights":null,"mmu":false,"materials":[],"dateFeatured":null,"downloadCount":18,"displayCount":285,"filesCount":3,"privateCollectionsCount":2,"publicCollectionsCount":2,"pdfFilePath":"media/prints/659431/pdfs/659431-crab-conundrum-puzzle-97fe96a3-9b29-4855-aa14-ab1d42826741.pdf","commentCount":5,"userGcodeCount":0,"remixCount":0,"canBeRated":false,"addMakePermission":null,"printer":null,"image":{"id":"2449749","filePath":"media/prints/659431/images/5195737_ee12531b-b2aa-4018-819a-fc085ccdd573_893ff41f-21be-458c-9bd7-d7b012febf5c/crabcon.jpeg","rotation":0,"imageHash":"5RcODwj3OLeEh3iPdnd3SGeIa68Hh3cA","imageWidth":1000,"imageHeight":1018,"__typename":"PrintImageType"},"images":[{"id":"2449749","filePath":"media/prints/659431/images/5195737_ee12531b-b2aa-4018-819a-fc085ccdd573_893ff41f-21be-458c-9bd7-d7b012febf5c/crabcon.jpeg","rotation":0,"imageHash":"5RcODwj3OLeEh3iPdnd3SGeIa68Hh3cA","imageWidth":1000,"imageHeight":1018,"__typename":"PrintImageType"},{"id":"2449748","filePath":"media/prints/659431/images/5195736_3840512f-adbc-4277-81cd-1e132c4e3327_0e4b36fa-dea5-4d7a-bf8e-a779ae405751/cchardware.jpeg","rotation":0,"imageHash":"aQgGBYD0hriOeJaNhUdmchF/k/EI","imageWidth":1000,"imageHeight":716,"__typename":"PrintImageType"},{"id":"2449750","filePath":"media/prints/659431/images/5195738_60379fd8-a8df-4d8f-83cb-8ca59a614fb2_f7742c15-f700-4bbc-be7e-4d6bbc96ae04/img_2644.jpeg","rotation":0,"imageHash":"JwgOFQD0GXeIh3iHd4mGiPV1CE+l","imageWidth":1000,"imageHeight":1333,"__typename":"PrintImageType"}],"imagesCount":3,"tags":[{"name":"puzzle","id":"79","__typename":"TagType"},{"name":"brainteaser","id":"10820","__typename":"TagType"},{"name":"crabconundrum","id":"182101","__typename":"TagType"}],"thingiverseLink":null,"filesType":null,"previewFile":{"id":"2777710","filePreviewPath":"media/prints/659431/stls/5195740_2eb7f075-26c7-46aa-b726-26baa3f2481d_b2bb9150-82cf-475c-8488-cae03442304a/ccbar_preview.png","__typename":"STLType"},"license":{"id":"4","disallowRemixing":false,"__typename":"LicenseType"},"remixParents":[],"remixDescription":null,"__typename":"PrintType","user":{"id":"222604","handle":"Crab","verified":false,"dateVerified":null,"publicUsername":"Crab","avatarFilePath":"media/auth/avatars/85/85e8835a-0edf-49ad-96f9-261d4ffcb3c1.jpg","badgesProfileLevel":{"profileLevel":23,"__typename":"BadgesProfileLevelType"},"__typename":"UserType","isFollowedByMe":false,"canBeFollowed":true,"designer":false}},"unavailableModel":null,"replies":[{"id":"1302043","created":"2023-11-26T12:49:58.515171+00:00","edited":"2023-11-26T13:17:17.208339+00:00","deleted":null,"isMake":false,"printer":null,"parent":{"id":"1302028","__typename":"PrintCommentType"},"author":{"id":"222604","handle":"Crab","verified":false,"dateVerified":null,"publicUsername":"Crab","avatarFilePath":"media/auth/avatars/85/85e8835a-0edf-49ad-96f9-261d4ffcb3c1.jpg","badgesProfileLevel":{"profileLevel":23,"__typename":"BadgesProfileLevelType"},"__typename":"UserType"},"images":[],"mentions":[{"id":"198328","handle":"robaki","__typename":"MentionListAssociationType"}],"text":"##user-198328## Thanks for the feedback. I was watching some spin it and they'd always hit it sideways, bringing the pins back out.. and I wanted to give an easier hint to spin the puzzle. Now I do find the thickness of the bottom of the ring a bit too large and I might make that ring thinner on the bottom to keep the bars from tilting too much. I was worried about the insets sticking, but I've built several and that hasn't been an issue (yet). I've cut the 35mm pins from stock, but those 5mm high cylinders would be tougher to handle when you need to file them. Ideally one would order or buy some M6 5mm pins. (or get a friend with a machine shop to cut you some!)","rating":null,"likesCount":0,"liked":null,"membershipAgeMonths":null,"modelData":{"model":{"id":"659431","ratingAvg":"5.0000000000","ratingCount":1,"__typename":"PrintType"},"__typename":"ModelDataType"},"membershipTier":null,"__typename":"PrintCommentType"},{"id":"1302289","created":"2023-11-26T14:45:29.868639+00:00","edited":null,"deleted":null,"isMake":false,"printer":null,"parent":{"id":"1302028","__typename":"PrintCommentType"},"author":{"id":"222604","handle":"Crab","verified":false,"dateVerified":null,"publicUsername":"Crab","avatarFilePath":"media/auth/avatars/85/85e8835a-0edf-49ad-96f9-261d4ffcb3c1.jpg","badgesProfileLevel":{"profileLevel":23,"__typename":"BadgesProfileLevelType"},"__typename":"UserType"},"images":[],"mentions":[{"id":"198328","handle":"robaki","__typename":"MentionListAssociationType"}],"text":"##user-198328## I created a new version of the ring that keeps the bars more level and is more reliable to 'open' the pins.","rating":null,"likesCount":0,"liked":null,"membershipAgeMonths":null,"modelData":{"model":{"id":"659431","ratingAvg":"5.0000000000","ratingCount":1,"__typename":"PrintType"},"__typename":"ModelDataType"},"membershipTier":null,"__typename":"PrintCommentType"},{"id":"1310957","created":"2023-11-29T15:50:02.955116+00:00","edited":null,"deleted":null,"isMake":false,"printer":null,"parent":{"id":"1302028","__typename":"PrintCommentType"},"author":{"id":"222604","handle":"Crab","verified":false,"dateVerified":null,"publicUsername":"Crab","avatarFilePath":"media/auth/avatars/85/85e8835a-0edf-49ad-96f9-261d4ffcb3c1.jpg","badgesProfileLevel":{"profileLevel":23,"__typename":"BadgesProfileLevelType"},"__typename":"UserType"},"images":[],"mentions":[{"id":"198328","handle":"robaki","__typename":"MentionListAssociationType"}],"text":"##user-198328## grin.. your name just triggered.. yeah.. that is where my 35mm pins came from!!!.. Love my Robaki 2! Still going strong. The newer ring design actually made it work much better for me.. Thanks again for nice comments.","rating":null,"likesCount":1,"liked":null,"membershipAgeMonths":null,"modelData":{"model":{"id":"659431","ratingAvg":"5.0000000000","ratingCount":1,"__typename":"PrintType"},"__typename":"ModelDataType"},"membershipTier":null,"__typename":"PrintCommentType"},{"id":"1311573","created":"2023-11-29T19:43:15.824682+00:00","edited":null,"deleted":null,"isMake":false,"printer":null,"parent":{"id":"1302028","__typename":"PrintCommentType"},"author":{"id":"198328","handle":"robaki","verified":false,"dateVerified":null,"publicUsername":"robaki","avatarFilePath":"media/auth/avatars/70/70978f95-108a-4fb7-b3b2-1965dbd740eb.png","badgesProfileLevel":{"profileLevel":15,"__typename":"BadgesProfileLevelType"},"__typename":"UserType"},"images":[],"mentions":[{"id":"222604","handle":"Crab","__typename":"MentionListAssociationType"}],"text":"Hey ##user-222604## , that's great to hear. The new ring has been a big help. It's made the puzzle solving more consistent. :)","rating":null,"likesCount":0,"liked":null,"membershipAgeMonths":null,"modelData":{"model":{"id":"659431","ratingAvg":"5.0000000000","ratingCount":1,"__typename":"PrintType"},"__typename":"ModelDataType"},"membershipTier":null,"__typename":"PrintCommentType"}]}}}

Crab Conundrum Puzzle

Crab Conundrum Puzzle

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