{"data":{"model":{"id":"214151","slug":"capillary-toy-gradient-generator","name":"Capillary Toy - Gradient Generator","authorship":"remix","club":false,"excludeCommercialUsage":false,"price":null,"eduProject":null,"ratingAvg":"0E-10","myRating":null,"ratingCount":0,"description":"

This is a remix of my capillary toy to create a color gradient in a simple, visible way. Most of the diffusion takes place in the paper towel, so this isn't really a mixing device. I'm interested in capillary-driven open-channel flow at the moment, and this is a fun way to play with that.

I included the 3d model for my old prototype because there may be slight differences to the center channel and output throat that make the old one work more reliably (in case anyone wants to get into the weeds on this). You have to cut the paper towel for it to fit in the old model, because I wasn't thinking that far ahead at the time. I cleaned up the geometry when modifying the output throat, which may have made it more finnicky to start.

Pro tip: rinse this off in the sink and dry with a paper towel before your demonstration. Try to get most of the liquid out of the three channels. The stuff you can't get sort of acts to \u201cprime\u201d it so it is easier to start.

Designed for PLA, but the ideal material for stuff like this should be Nylon.

Old version:

","category":{"id":"92","path":[{"id":"90","name":"Learning","nameEn":"Learning","description":"Be inventive! Learn about the world around you and print tools to help you understand. If you are a teacher you will appreciate these educational tools.","__typename":"CategoryType"},{"id":"92","name":"Chemistry & Biology","nameEn":"Chemistry & Biology","description":"Educate yourself and others! With a DNA building kit, spine, and molecular models you can demonstrate the laws of nature in your lessons.","__typename":"CategoryType"}],"__typename":"CategoryType"},"modified":"2023-12-13T01:52:57.263078+00:00","firstPublish":"2022-05-26T17:19:45.230998+00:00","datePublished":"2023-12-13T01:52:57.228768+00:00","dateCreatedThingiverse":null,"nsfw":false,"summary":"This design creates a color gradient in a paper towel by using capillary action and open channel flow.","likesCount":13,"makesCount":0,"liked":null,"printDuration":"1.29","numPieces":1,"weight":"15.00","nozzleDiameters":["0.40"],"usedMaterial":null,"layerHeights":["0.15"],"mmu":false,"materials":[{"id":"1","name":"PLA","__typename":"MaterialTypeType"}],"dateFeatured":null,"downloadCount":34,"displayCount":554,"filesCount":7,"privateCollectionsCount":10,"publicCollectionsCount":10,"pdfFilePath":"media/prints/214151/pdfs/214151-capillary-toy-gradient-generator-bd9550fe-18ca-4ab5-82a3-5c0d302175b2.pdf","commentCount":2,"userGcodeCount":0,"remixCount":0,"canBeRated":false,"printer":{"id":"18","name":"Prusa MINI / MINI+","__typename":"PrinterTypeType"},"image":{"id":"968424","filePath":"media/prints/214151/images/1958482_2912016b-4b13-41fc-b5da-c92642ebb227/img_20220525_220758610_hdr.jpg","rotation":0,"imageHash":"5igKDQKYZ4V2B4dXiIKJaJVvfPn4","imageWidth":3000,"imageHeight":4000,"__typename":"PrintImageType"},"images":[{"id":"968424","filePath":"media/prints/214151/images/1958482_2912016b-4b13-41fc-b5da-c92642ebb227/img_20220525_220758610_hdr.jpg","rotation":0,"imageHash":"5igKDQKYZ4V2B4dXiIKJaJVvfPn4","imageWidth":3000,"imageHeight":4000,"__typename":"PrintImageType"}],"tags":[{"name":"experiment","id":"2081","__typename":"TagType"},{"name":"science","id":"2082","__typename":"TagType"},{"name":"microfluidics","id":"3267","__typename":"TagType"},{"name":"scienceeducation","id":"8734","__typename":"TagType"},{"name":"capillary","id":"79079","__typename":"TagType"},{"name":"capillarynetwork","id":"88586","__typename":"TagType"},{"name":"capillaryaction","id":"88588","__typename":"TagType"},{"name":"colorgradient","id":"88816","__typename":"TagType"},{"name":"capillarypump","id":"88827","__typename":"TagType"},{"name":"gradientgenerator","id":"88828","__typename":"TagType"}],"thingiverseLink":null,"filesType":"GCODE","previewFile":{"id":"887530","filePreviewPath":"media/prints/214151/stls/1958481_b9cc2656-4200-4872-808f-9991a3eead89/capillary-toy-gradient-generator_preview.png","__typename":"STLType"},"license":{"id":"7","disallowRemixing":false,"__typename":"LicenseType"},"remixParents":[{"id":"12432","modelId":"213247","modelName":"Capillary Toys (Educational / Experimental)","modelAuthor":{"id":"21282","handle":"Quinn_21282","verified":false,"publicUsername":"Quinn","__typename":"UserType"},"model":{"id":"213247","name":"Capillary Toys (Educational / Experimental)","slug":"capillary-toys-educational-experimental","datePublished":"2023-12-13T01:49:44.954726+00:00","image":{"id":"965518","filePath":"media/prints/213247/images/1952421_98727125-3cb1-4e6b-ace2-43467ae624b9/img_20220525_001355502_hdr.jpg","rotation":0,"imageHash":"JCkGDYI6d2mQd4holpV3hfiJj4/4","imageWidth":4000,"imageHeight":3000,"__typename":"PrintImageType"},"club":false,"authorship":"author","license":{"id":"7","name":"Creative Commons \u2014 Public Domain","disallowRemixing":false,"__typename":"LicenseType"},"eduProject":null,"__typename":"PrintType"},"url":null,"urlAuthor":null,"urlImage":null,"urlTitle":null,"urlLicense":null,"urlLicenseText":null,"__typename":"PrintRemixType"}],"remixDescription":"

Redesigned to use a paper towel as the capillary pump, which inspired the idea to use three reservoirs and output a color gradient.

","__typename":"PrintType","user":{"id":"21282","handle":"Quinn_21282","verified":false,"dateVerified":null,"publicUsername":"Quinn","avatarFilePath":"media/auth/avatars/a0/a0fa135c-70a8-4cb6-a9dc-950b7066b42a.jpg","badgesProfileLevel":{"profileLevel":8,"__typename":"BadgesProfileLevelType"},"__typename":"UserType","isFollowedByMe":false,"isHiddenForMe":false,"canBeFollowed":true,"billingAccountType":"personal","lowestTierPrice":null,"highlightedModels":{"models":[{"id":"213247","name":"Capillary Toys (Educational / Experimental)","slug":"capillary-toys-educational-experimental","ratingAvg":"0E-10","likesCount":25,"liked":null,"datePublished":"2023-12-13T01:49:44.954726+00:00","dateFeatured":null,"firstPublish":"2022-05-25T07:27:35.167544+00:00","downloadCount":85,"mmu":false,"category":{"id":"92","path":[{"id":"90","name":"Learning","nameEn":"Learning","__typename":"CategoryType"},{"id":"92","name":"Chemistry & Biology","nameEn":"Chemistry & Biology","__typename":"CategoryType"}],"__typename":"CategoryType"},"modified":"2023-12-13T01:49:44.975411+00:00","image":{"id":"965518","filePath":"media/prints/213247/images/1952421_98727125-3cb1-4e6b-ace2-43467ae624b9/img_20220525_001355502_hdr.jpg","rotation":0,"imageHash":"JCkGDYI6d2mQd4holpV3hfiJj4/4","imageWidth":4000,"imageHeight":3000,"__typename":"PrintImageType"},"nsfw":false,"club":false,"price":null,"user":{"id":"21282","handle":"Quinn_21282","verified":false,"dateVerified":null,"publicUsername":"Quinn","avatarFilePath":"media/auth/avatars/a0/a0fa135c-70a8-4cb6-a9dc-950b7066b42a.jpg","badgesProfileLevel":{"profileLevel":8,"__typename":"BadgesProfileLevelType"},"__typename":"UserType","isHiddenForMe":false},"latestContestResult":null,"__typename":"PrintType"},{"id":"214124","name":"Microfluidic Gradient Generator","slug":"microfluidic-gradient-generator","ratingAvg":"0E-10","likesCount":19,"liked":null,"datePublished":"2022-11-01T21:49:54.043489+00:00","dateFeatured":null,"firstPublish":"2022-05-26T16:39:32.059506+00:00","downloadCount":216,"mmu":false,"category":{"id":"92","path":[{"id":"90","name":"Learning","nameEn":"Learning","__typename":"CategoryType"},{"id":"92","name":"Chemistry & Biology","nameEn":"Chemistry & Biology","__typename":"CategoryType"}],"__typename":"CategoryType"},"modified":"2022-11-01T21:49:54.064591+00:00","image":{"id":"968361","filePath":"media/prints/214124/images/1958339_364a3e7e-32f2-4d92-a223-02b700b154de/capture.png","rotation":0,"imageHash":"NwgKBID5doiWaId+hmkHaXGAFg==","imageWidth":1242,"imageHeight":716,"__typename":"PrintImageType"},"nsfw":false,"club":false,"price":null,"user":{"id":"21282","handle":"Quinn_21282","verified":false,"dateVerified":null,"publicUsername":"Quinn","avatarFilePath":"media/auth/avatars/a0/a0fa135c-70a8-4cb6-a9dc-950b7066b42a.jpg","badgesProfileLevel":{"profileLevel":8,"__typename":"BadgesProfileLevelType"},"__typename":"UserType","isHiddenForMe":false},"latestContestResult":null,"__typename":"PrintType"},{"id":"214151","name":"Capillary Toy - Gradient Generator","slug":"capillary-toy-gradient-generator","ratingAvg":"0E-10","likesCount":13,"liked":null,"datePublished":"2023-12-13T01:52:57.228768+00:00","dateFeatured":null,"firstPublish":"2022-05-26T17:19:45.230998+00:00","downloadCount":34,"mmu":false,"category":{"id":"92","path":[{"id":"90","name":"Learning","nameEn":"Learning","__typename":"CategoryType"},{"id":"92","name":"Chemistry & Biology","nameEn":"Chemistry & Biology","__typename":"CategoryType"}],"__typename":"CategoryType"},"modified":"2023-12-13T01:52:57.263078+00:00","image":{"id":"968424","filePath":"media/prints/214151/images/1958482_2912016b-4b13-41fc-b5da-c92642ebb227/img_20220525_220758610_hdr.jpg","rotation":0,"imageHash":"5igKDQKYZ4V2B4dXiIKJaJVvfPn4","imageWidth":3000,"imageHeight":4000,"__typename":"PrintImageType"},"nsfw":false,"club":false,"price":null,"user":{"id":"21282","handle":"Quinn_21282","verified":false,"dateVerified":null,"publicUsername":"Quinn","avatarFilePath":"media/auth/avatars/a0/a0fa135c-70a8-4cb6-a9dc-950b7066b42a.jpg","badgesProfileLevel":{"profileLevel":8,"__typename":"BadgesProfileLevelType"},"__typename":"UserType","isHiddenForMe":false},"latestContestResult":null,"__typename":"PrintType"},{"id":"54511","name":"Secret Ring Holder","slug":"secret-ring-holder","ratingAvg":"0E-10","likesCount":13,"liked":null,"datePublished":"2021-01-29T19:37:49.970447+00:00","dateFeatured":null,"firstPublish":"2021-01-29T19:37:49.970447+00:00","downloadCount":48,"mmu":false,"category":{"id":"42","path":[{"id":"17","name":"Fashion","nameEn":"Fashion","__typename":"CategoryType"},{"id":"42","name":"Other Fashion Accessories","nameEn":"Other Fashion Accessories","__typename":"CategoryType"}],"__typename":"CategoryType"},"modified":"2021-01-30T04:22:32.055504+00:00","image":{"id":"256867","filePath":"media/prints/54511/images/540711_445715ac-c87d-4710-9c88-1aad025e4bd4/img_20210129_223015_469.jpg","rotation":0,"imageHash":"k1kKHoY/WYLZVXdjVZeGZoiGPMCnQEo=","imageWidth":1080,"imageHeight":946,"__typename":"PrintImageType"},"nsfw":false,"club":false,"price":null,"user":{"id":"21282","handle":"Quinn_21282","verified":false,"dateVerified":null,"publicUsername":"Quinn","avatarFilePath":"media/auth/avatars/a0/a0fa135c-70a8-4cb6-a9dc-950b7066b42a.jpg","badgesProfileLevel":{"profileLevel":8,"__typename":"BadgesProfileLevelType"},"__typename":"UserType","isHiddenForMe":false},"latestContestResult":null,"__typename":"PrintType"},{"id":"208478","name":"Goose Egg Crate / Carton","slug":"goose-egg-crate-carton","ratingAvg":"5.0000000000","likesCount":11,"liked":null,"datePublished":"2022-05-18T14:48:45.470057+00:00","dateFeatured":null,"firstPublish":"2022-05-18T14:48:45.470057+00:00","downloadCount":74,"mmu":false,"category":{"id":"53","path":[{"id":"3","name":"Household","nameEn":"Household","__typename":"CategoryType"},{"id":"53","name":"Outdoor & Garden","nameEn":"Outdoor & Garden","__typename":"CategoryType"}],"__typename":"CategoryType"},"modified":"2022-05-18T14:48:45.481729+00:00","image":{"id":"947783","filePath":"media/prints/208478/images/1914534_79954312-c952-478d-aeaf-37fdf1337ea1/img_20220518_070415787_hdr.jpg","rotation":0,"imageHash":"ISkGDYCHV4eJdXaIdQm3iPmZuo+o","imageWidth":4000,"imageHeight":3000,"__typename":"PrintImageType"},"nsfw":false,"club":false,"price":null,"user":{"id":"21282","handle":"Quinn_21282","verified":false,"dateVerified":null,"publicUsername":"Quinn","avatarFilePath":"media/auth/avatars/a0/a0fa135c-70a8-4cb6-a9dc-950b7066b42a.jpg","badgesProfileLevel":{"profileLevel":8,"__typename":"BadgesProfileLevelType"},"__typename":"UserType","isHiddenForMe":false},"latestContestResult":null,"__typename":"PrintType"},{"id":"78650","name":"Keep off the Dirigible Plums Garden Sign","slug":"keep-off-the-dirigible-plums-garden-sign","ratingAvg":"0E-10","likesCount":11,"liked":null,"datePublished":"2021-10-12T05:17:49.834484+00:00","dateFeatured":null,"firstPublish":"2021-10-12T05:17:49.834484+00:00","downloadCount":41,"mmu":false,"category":{"id":"53","path":[{"id":"3","name":"Household","nameEn":"Household","__typename":"CategoryType"},{"id":"53","name":"Outdoor & Garden","nameEn":"Outdoor & Garden","__typename":"CategoryType"}],"__typename":"CategoryType"},"modified":"2021-10-13T20:41:09.895441+00:00","image":{"id":"443094","filePath":"media/prints/78650/images/848484_b4e42241-ffa9-4cfb-ae0e-0db33bf01027/img_20211012_115309_315.jpg","rotation":0,"imageHash":"FQkKDYIHR4d0eoiHdYdmc09xqQMW","imageWidth":2511,"imageHeight":1755,"__typename":"PrintImageType"},"nsfw":false,"club":false,"price":null,"user":{"id":"21282","handle":"Quinn_21282","verified":false,"dateVerified":null,"publicUsername":"Quinn","avatarFilePath":"media/auth/avatars/a0/a0fa135c-70a8-4cb6-a9dc-950b7066b42a.jpg","badgesProfileLevel":{"profileLevel":8,"__typename":"BadgesProfileLevelType"},"__typename":"UserType","isHiddenForMe":false},"latestContestResult":null,"__typename":"PrintType"},{"id":"292832","name":"Toothbrush Holder (Horizontal / Drawer)","slug":"toothbrush-holder-horizontal-drawer","ratingAvg":"0E-10","likesCount":4,"liked":null,"datePublished":"2022-10-11T00:35:09.835148+00:00","dateFeatured":null,"firstPublish":"2022-10-11T00:35:09.832092+00:00","downloadCount":22,"mmu":false,"category":{"id":"5","path":[{"id":"3","name":"Household","nameEn":"Household","__typename":"CategoryType"},{"id":"5","name":"Bathroom","nameEn":"Bathroom","__typename":"CategoryType"}],"__typename":"CategoryType"},"modified":"2022-10-11T00:35:09.858079+00:00","image":{"id":"1259510","filePath":"media/prints/292832/images/2572450_5c06a9c9-598e-47e4-b2d0-ddfcb386789e/pxl_20221011_001936660.jpg","rotation":0,"imageHash":"JQgGHYT5RUc+skRJYWZIRPFqHK/G","imageWidth":4032,"imageHeight":3024,"__typename":"PrintImageType"},"nsfw":false,"club":false,"price":null,"user":{"id":"21282","handle":"Quinn_21282","verified":false,"dateVerified":null,"publicUsername":"Quinn","avatarFilePath":"media/auth/avatars/a0/a0fa135c-70a8-4cb6-a9dc-950b7066b42a.jpg","badgesProfileLevel":{"profileLevel":8,"__typename":"BadgesProfileLevelType"},"__typename":"UserType","isHiddenForMe":false},"latestContestResult":null,"__typename":"PrintType"},{"id":"89965","name":"Propeller Speed Reduction Unit (School Project)","slug":"propeller-speed-reduction-unit-school-project","ratingAvg":"0E-10","likesCount":4,"liked":null,"datePublished":"2021-11-30T22:06:36.323950+00:00","dateFeatured":null,"firstPublish":"2021-11-30T22:06:36.323950+00:00","downloadCount":17,"mmu":false,"category":{"id":"93","path":[{"id":"90","name":"Learning","nameEn":"Learning","__typename":"CategoryType"},{"id":"93","name":"Engineering","nameEn":"Engineering","__typename":"CategoryType"}],"__typename":"CategoryType"},"modified":"2021-11-30T22:06:36.341564+00:00","image":{"id":"491413","filePath":"media/prints/89965/images/946531_ea91ec73-fe52-4b2e-9166-0d683d1f7884/screenshot_20210926-211020.png","rotation":0,"imageHash":"WTkGH4JYSkpmZKZfkMaXl3iGlQqnu3AI","imageWidth":760,"imageHeight":755,"__typename":"PrintImageType"},"nsfw":false,"club":false,"price":null,"user":{"id":"21282","handle":"Quinn_21282","verified":false,"dateVerified":null,"publicUsername":"Quinn","avatarFilePath":"media/auth/avatars/a0/a0fa135c-70a8-4cb6-a9dc-950b7066b42a.jpg","badgesProfileLevel":{"profileLevel":8,"__typename":"BadgesProfileLevelType"},"__typename":"UserType","isHiddenForMe":false},"latestContestResult":null,"__typename":"PrintType"}],"featured":false,"__typename":"HighlightedModelsType"},"designer":false,"stripeAccountActive":null,"membership":null},"contests":[],"contestsResults":[],"prusameterPoints":null,"latestContestResult":null}}}