{"data":{"model":{"id":"453526","slug":"3-point-bending-test","name":"3-Point Bending Test","authorship":"author","club":false,"excludeCommercialUsage":false,"price":null,"eduProject":null,"ratingAvg":"5.0000000000","myRating":null,"ratingCount":1,"description":"

Introduction

If you have ever seen a video from CNC Kitchen or are interested in materials testing, you have probably heard of a 3-point bending test (see Wikipedia).
It can be used to analyse the stiffness of materials.

For this, a sample is placed between two points. If you now apply a force to the sample in the middle (i.e. at the third point), it deforms elastically. The goal is now to measure this bending as accurately as possible. For example: how far does a sample made of PETG bend with a force of 12 N?

With this design, the force can be applied to the specimen by attaching weights or pulling by hand. The deformation is measured by a precision dial indicator that can be adjusted in height on the 3030 T-Slot profile.

Want to see it in action?
Check out one of my videos:

BOM

In the following list you will find everything that is additionally required in terms of screws and profiles.

Parts	Quantity
Cap Head Screws
M3 x 16 mm	2
M5 x 20 mm	3
M6 x 12 mm	3
M8 x 50 mm	2
(T-) Nuts
M3 self securing nut	2
M5 T-Nut for 2020 T-Slot	3
M6 T-Nut for 3030 T-Slot	3
M8 nut	2
Aluminium profiles
2020 T-Slot 250 mm (can also be longer)	1
3030 T-Slot 160 mm (min 100 mm)	1
Others
8 mm thick rod x 18 mm	1
Optional
2020 Endcap	2
3030 Endcap	1

A precision dial indicator and weights are also needed. For the weights, a bucket and beverage cans, sand, etc. can be used.

Assembly

Print the parts \u201cbase.stl\u201d, \u201cdial-Indicator-holder.stl\u201d and \u201csample-hook.stl\u201d
Slide the 2020 profile into the lower opening and the 3030 into the upper holder
Add matching T-nuts to the locations of the holes
Fasten the 2020 profile with three M5 x 20 mm screws
Fasten the 3030 profile with an M6 x 12 mm screw
Screw the two M8 x 50 mm screws into the base and secure them at the end with two M8 nuts
Slide the dial indicator into the holder and tighten it with the two M3 x 16 mm screws and self-locking nuts. Make sure that the gauge is firmly in place. Do not overtighten them!
Slide the holder into the 3030 profile with two M6 x 12 mm screws and T-nuts and tighten the screws lightly
(Optional) Add end caps to the ends of the profiles
Press the 16 mm piece of the 8 mm shaft into the sample hook
Done!

Printing the samples

Use 15 Perimeters.

Running a test

To be continued soon

","category":{"id":"93","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":"93","name":"Engineering","nameEn":"Engineering","description":"Become a 3D printing engineer. Combine different methods of manufacturing. Improve existing solutions or make a prototype with mechanical parts.","__typename":"CategoryType"}],"__typename":"CategoryType"},"modified":"2024-07-28T11:46:35.054250+00:00","firstPublish":"2023-04-15T21:36:57.126539+00:00","datePublished":"2024-07-28T11:46:35.037905+00:00","dateCreatedThingiverse":null,"nsfw":false,"summary":"A printable 3-Point Bending Test to test filaments at home and determine their Young's modulus E!","likesCount":46,"makesCount":0,"liked":null,"printDuration":null,"numPieces":0,"weight":null,"nozzleDiameters":null,"usedMaterial":null,"layerHeights":null,"mmu":false,"materials":[],"dateFeatured":null,"downloadCount":139,"displayCount":1970,"filesCount":3,"privateCollectionsCount":38,"publicCollectionsCount":23,"pdfFilePath":"media/prints/453526/pdfs/453526-3-point-bending-test-51242c69-005b-45b8-811c-0bf244c23115.pdf","commentCount":9,"userGcodeCount":0,"remixCount":0,"canBeRated":false,"printer":null,"image":{"id":"1789500","filePath":"media/prints/453526/images/3742251_af2f4a97-f9ce-4f09-b681-e31434278412/3-point-bending-test.jpeg","rotation":0,"imageHash":"eNcJHYbXZ6d7h3WMdQiYfPh+i++3","imageWidth":3710,"imageHeight":2912,"__typename":"PrintImageType"},"images":[{"id":"1789500","filePath":"media/prints/453526/images/3742251_af2f4a97-f9ce-4f09-b681-e31434278412/3-point-bending-test.jpeg","rotation":0,"imageHash":"eNcJHYbXZ6d7h3WMdQiYfPh+i++3","imageWidth":3710,"imageHeight":2912,"__typename":"PrintImageType"},{"id":"1784234","filePath":"media/prints/453526/images/3730961_7cf998b8-9c6a-402f-8270-fbf5c943657f/img_4280.jpeg","rotation":0,"imageHash":"KPgFFYT3V7h5dpR9hAmYfvh8is+3","imageWidth":4032,"imageHeight":3024,"__typename":"PrintImageType"},{"id":"1784228","filePath":"media/prints/453526/images/3730960_f6c64037-94a1-487e-9172-2de16ecff9a4/img_4283.jpeg","rotation":0,"imageHash":"J/gNHYb3WmV5l3aGaJhniPd8hd9X","imageWidth":4032,"imageHeight":3024,"__typename":"PrintImageType"},{"id":"1784233","filePath":"media/prints/453526/images/3730962_1b0af3c1-fc99-467b-adce-c69ecba497c6/img_4284.jpeg","rotation":0,"imageHash":"aAgGDYL4Nrl4d5R7hTqYfvl7mb+n","imageWidth":4032,"imageHeight":3024,"__typename":"PrintImageType"},{"id":"1784232","filePath":"media/prints/453526/images/3730964_52a925e9-31e6-4d25-8e4b-7c9890ffef3d/img_4286.jpeg","rotation":0,"imageHash":"J/gJFYT70Qhol3eHZ6hod/uKrK/I","imageWidth":4032,"imageHeight":3024,"__typename":"PrintImageType"},{"id":"1784230","filePath":"media/prints/453526/images/3730959_f88492db-05cc-45cb-a93f-8df256244a0a/img_4282.jpeg","rotation":0,"imageHash":"J/gNFYT4R5WId4h4h5h3iPl6mq+m","imageWidth":4032,"imageHeight":3024,"__typename":"PrintImageType"},{"id":"1784231","filePath":"media/prints/453526/images/3730963_98c24cb4-cb16-406e-92d0-08436766d548/img_4289.jpeg","rotation":0,"imageHash":"I/gJFYT1nDd7lXl2iJh4h/WPV/94","imageWidth":4032,"imageHeight":3024,"__typename":"PrintImageType"},{"id":"1784235","filePath":"media/prints/453526/images/3730971_e2fedfba-e3c7-4c2a-852c-9463d98fcb00/img_4292.jpeg","rotation":0,"imageHash":"ZwgKDYL5N6d8doaDiKmWhfp8tK+G","imageWidth":4032,"imageHeight":3024,"__typename":"PrintImageType"}],"tags":[{"name":"filamenttest","id":"13199","__typename":"TagType"},{"name":"materialtest","id":"27540","__typename":"TagType"},{"name":"materialtesting","id":"60468","__typename":"TagType"},{"name":"bendingtest","id":"126683","__typename":"TagType"},{"name":"threepointbedning","id":"145359","__typename":"TagType"}],"thingiverseLink":null,"filesType":null,"previewFile":{"id":"1968100","filePreviewPath":"media/prints/453526/stls/3730764_066fb272-5a5d-4a4d-8d44-21b5213e288d/base_preview.png","__typename":"STLType"},"license":{"id":"3","disallowRemixing":false,"__typename":"LicenseType"},"remixParents":[],"remixDescription":null,"__typename":"PrintType","user":{"id":"29320","handle":"JanTec","verified":true,"dateVerified":"2023-11-07T13:00:32.692144+00:00","publicUsername":"JanTec","avatarFilePath":"media/auth/avatars/18/18084e7e-b99a-411b-9b06-fa616e6c9737.jpeg","badgesProfileLevel":{"profileLevel":24,"__typename":"BadgesProfileLevelType"},"__typename":"UserType","isFollowedByMe":false,"isHiddenForMe":false,"canBeFollowed":true,"billingAccountType":"personal","lowestTierPrice":null,"highlightedModels":{"models":[{"id":"488391","name":"Upgrade for Sauter Crank test stand TVL [Tensile test]","slug":"upgrade-for-sauter-crank-test-stand-tvl-tensile-te","ratingAvg":"5.0000000000","likesCount":23,"liked":null,"datePublished":"2024-07-28T11:45:39.789334+00:00","dateFeatured":null,"firstPublish":"2023-05-23T09:56:54.690045+00:00","downloadCount":54,"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":"2024-07-28T11:45:39.811180+00:00","image":{"id":"1903052","filePath":"media/prints/488391/images/3986298_84489885-ea5d-4914-b80b-b8d614c3a791/img_4866.jpeg","rotation":0,"imageHash":"OAgOBID4RYp5lmiHeIcHhmaQlw==","imageWidth":3775,"imageHeight":2352,"__typename":"PrintImageType"},"nsfw":false,"club":false,"price":null,"user":{"id":"29320","handle":"JanTec","verified":true,"dateVerified":"2023-11-07T13:00:32.692144+00:00","publicUsername":"JanTec","avatarFilePath":"media/auth/avatars/18/18084e7e-b99a-411b-9b06-fa616e6c9737.jpeg","badgesProfileLevel":{"profileLevel":24,"__typename":"BadgesProfileLevelType"},"__typename":"UserType","isHiddenForMe":false},"latestContestResult":null,"__typename":"PrintType"},{"id":"453526","name":"3-Point Bending Test","slug":"3-point-bending-test","ratingAvg":"5.0000000000","likesCount":46,"liked":null,"datePublished":"2024-07-28T11:46:35.037905+00:00","dateFeatured":null,"firstPublish":"2023-04-15T21:36:57.126539+00:00","downloadCount":139,"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":"2024-07-28T11:46:35.054250+00:00","image":{"id":"1789500","filePath":"media/prints/453526/images/3742251_af2f4a97-f9ce-4f09-b681-e31434278412/3-point-bending-test.jpeg","rotation":0,"imageHash":"eNcJHYbXZ6d7h3WMdQiYfPh+i++3","imageWidth":3710,"imageHeight":2912,"__typename":"PrintImageType"},"nsfw":false,"club":false,"price":null,"user":{"id":"29320","handle":"JanTec","verified":true,"dateVerified":"2023-11-07T13:00:32.692144+00:00","publicUsername":"JanTec","avatarFilePath":"media/auth/avatars/18/18084e7e-b99a-411b-9b06-fa616e6c9737.jpeg","badgesProfileLevel":{"profileLevel":24,"__typename":"BadgesProfileLevelType"},"__typename":"UserType","isHiddenForMe":false},"latestContestResult":null,"__typename":"PrintType"},{"id":"539080","name":"Gridfinity Base for Original Prusa Enclosure (3x1)","slug":"gridfinity-base-for-original-prusa-enclosure-3x1","ratingAvg":"5.0000000000","likesCount":62,"liked":null,"datePublished":"2023-08-15T09:25:56.787143+00:00","dateFeatured":null,"firstPublish":"2023-07-29T20:57:30.991786+00:00","downloadCount":191,"mmu":false,"category":{"id":"40","path":[{"id":"1","name":"3D Printers","nameEn":"3D Printers","__typename":"CategoryType"},{"id":"40","name":"Accessories","nameEn":"Accessories","__typename":"CategoryType"}],"__typename":"CategoryType"},"modified":"2023-08-15T09:25:56.805248+00:00","image":{"id":"2064322","filePath":"media/prints/539080/images/4343291_9516f113-9f31-482e-b1e1-e497f4dfde01/img_5716.jpeg","rotation":0,"imageHash":"oBgODYLximSYiXl4h3eId1eIgJUI","imageWidth":4032,"imageHeight":3024,"__typename":"PrintImageType"},"nsfw":false,"club":false,"price":null,"user":{"id":"29320","handle":"JanTec","verified":true,"dateVerified":"2023-11-07T13:00:32.692144+00:00","publicUsername":"JanTec","avatarFilePath":"media/auth/avatars/18/18084e7e-b99a-411b-9b06-fa616e6c9737.jpeg","badgesProfileLevel":{"profileLevel":24,"__typename":"BadgesProfileLevelType"},"__typename":"UserType","isHiddenForMe":false},"latestContestResult":null,"__typename":"PrintType"}],"featured":true,"__typename":"HighlightedModelsType"},"designer":false,"stripeAccountActive":null,"membership":null},"contests":[],"contestsResults":[],"prusameterPoints":null,"latestContestResult":null}}}