{"data":{"model":{"id":"933184","slug":"honda-urban-express-nu50m-sealed-beam-headlight-ad","name":"Honda Urban Express NU50/M Sealed Beam Headlight Adapter for 1157 Bulbs","authorship":"author","club":false,"excludeCommercialUsage":false,"price":null,"eduProject":null,"ratingAvg":"4.0000000000","myRating":null,"ratingCount":1,"description":"

UPDATE v2.5.1

Added arrow and text to show the top of the adapter. You no longer need to print in a certain way to help you align it! Simply point the arrow directly toward the top of the headlight when gluing, and use the 1157 bulb to nudge it into the right place. There is a small ridge in the center hole to help you with this.

UPDATE v2.5

Increased socket hole slightly. You shouldn't need to cut the seam out of the inside to get it to fit. There is still a little interference at the socket tabs, requiring you to press the socket in. This is on purpose to help prevent the socket from backing out even if, somehow, it rotates enough to unlock. If you print this model and still have issues, please let me know, and I'll continue to improve it!

UPDATE v2

Improved version requires no supports and fits better in the headlight casing. V1 remains available if you prefer.

Overview

The Honda Urban Express NU50 / NU50M is a moped produced from 1982 to 1983. It uses a rare, discontinued sealed beam assembly for the main headlight and when they can even be found, they are only available expensively as NOS or used. They are often burnt out, if the moped was run with a dead battery. This adapter attaches to the rear of the headlight, and adapts a cheap 1157 holder and bulb to the assembly.

Print Settings

Infill: 15% (not critical)
Perimeters: 2 minimum

Assembly Instructions

Link to 1157 bulb holder: https://www.amazon.com/dp/B01LWUUVGV

VERY IMPORTANT: A headlight with high/low beams REQUIRES the adapter be oriented correctly. This is because headlights use the slight offset between the two filaments to reflect the light a little higher.

1. Cut off the existing headlight bulb and wiring, and grind any remaining ridge flat. Break out and remove the old and remaining assembly, taking care not to break the front glass.

2. Use a step bit (https://www.amazon.com/Neiko-10174A-Change-Spiral-Grooved/dp/B089T8HJHF for example) to widen the hole just large enough to allow the 1157 bulb to pass.

3. Lightly sand the back of the lamp to remove any residues and provide a good gluing surface.

4. FIT TEST THE HOLDER TO THE ASSEMBLY FIRST. Orient the arrow toward the top of the lamp. Super glue (semi-permanent) or epoxy (permanent) the adapter over the hole. If you cut the hole just large enough to accept the bulb, push it gently through the adapter and hole to help align it. Allow it to dry or cure completely, as any vibration will cause the joint to fail and the adapter will fall off.

5. Create your wiring harness by using butt connectors, or spade or bullet removable connectors, to join the wires. Wiring is as shown in the picture.

6. After the glue or epoxy is dry, mount the bulb and holder to the adapter.

Reinstall the headlight to the holder if you've removed it, and reinstall the headlight assembly. You may have to slightly reroute the wires--it helps to wind the headlight wires loosely around the adapter.

Start the moped and test the light. If mounted correctly, low beam should point toward the ground a few tens of feet ahead. High beam should point almost parallel to the ground, casting a brighter beam further away. Adjust the headlight as needed for best visibility.

NOTE: This is a work-in-progress. I would like help perfecting the bulb distance to get the best focus. Also, if a more commonly-available 1157 socket can be found, please let me know. This was just the first one I could find with good mounting features.

Instructions for older variants

Seam Alignment: Rear (this is to serve as an assembly mark to orient the adapter correctly)
Orientation on build plate: Use included .3mf file or refer to pictures. Seam points toward the bottom screw.

VERY IMPORTANT: A headlight with high/low beams REQUIRES the adapter be oriented correctly. This is because headlights use the slight offset between the two filaments to reflect the light a little higher. If you print with the seam in the right place, this seam should be exactly in line with the bottom of the lamp, pointing toward the center mounting screw hole. The first picture shows this alignment.

Also, the 3mf file has the part in the correct orientation. If you don't have a Prusa MK4, open it for study, and align the STEP file correctly. This will place the seam in the right place to serve as a guide.

IF THE SOCKET IS UPSIDE DOWN WHEN INSTALLED, HIGH BEAM WILL NOT WORK CORRECTLY. THE WIRES SHOULD POINT DOWNWARD TOWARD THE BOTTOM OF THE LAMP.

","category":{"id":"89","path":[{"id":"48","name":"Hobby & Makers","nameEn":"Hobby & Makers","description":"Are you a maker? Everyone is, be a printer. Upgrade your home workshop and combine different materials and methods of crafting including 3D printing.","__typename":"CategoryType"},{"id":"89","name":"Automotive","nameEn":"Automotive","description":"Tune your car with some cool 3D printed equipment - cup or phone holders, fuel funnel, valve cup, parking disc, wheel stopper, or car brand logos.","__typename":"CategoryType"}],"__typename":"CategoryType"},"modified":"2025-04-11T16:18:03.748491+00:00","firstPublish":"2024-07-05T04:34:40.210230+00:00","datePublished":"2025-04-11T16:18:03.725669+00:00","dateCreatedThingiverse":null,"nsfw":false,"aiGenerated":false,"politicalContent":false,"summary":"This is an adapter to convert the Honda Urban Express sealed beam headlight to replaceable 1157 bulbs.","likesCount":5,"makesCount":1,"liked":null,"printDuration":null,"numPieces":0,"weight":null,"nozzleDiameters":null,"usedMaterial":null,"layerHeights":null,"mmu":false,"materials":[],"dateFeatured":null,"downloadCount":86,"displayCount":637,"filesCount":9,"privateCollectionsCount":6,"publicCollectionsCount":2,"pdfFilePath":"media/prints/933184/pdfs/933184-honda-urban-express-nu50m-sealed-beam-headlight-adapter-for-1157-bulbs-156c7ce7-2100-4884-a4c1-b5aa6f24397c.pdf","commentCount":1,"userGcodeCount":0,"remixCount":0,"canBeRated":false,"addMakePermission":null,"printer":null,"image":{"id":"4335008","filePath":"media/prints/446d7d90-b78e-431d-8500-e74b99189efb/images/9474844_1d273392-ce99-4d07-b905-07e66887b90a_886e0b29-2804-444e-b60c-b5e1e0c1d4d6/screenshot-2025-04-11-121652.png","rotation":0,"imageHash":"8PcJBoCldImfp4iJiXdXp2eH2Jyfu/o=","imageWidth":1086,"imageHeight":934,"__typename":"PrintImageType"},"images":[{"id":"4335008","filePath":"media/prints/446d7d90-b78e-431d-8500-e74b99189efb/images/9474844_1d273392-ce99-4d07-b905-07e66887b90a_886e0b29-2804-444e-b60c-b5e1e0c1d4d6/screenshot-2025-04-11-121652.png","rotation":0,"imageHash":"8PcJBoCldImfp4iJiXdXp2eH2Jyfu/o=","imageWidth":1086,"imageHeight":934,"__typename":"PrintImageType"},{"id":"3304914","filePath":"media/prints/933184/images/7117431_4191df28-2c61-4525-8032-0b7af2e69326_9fac675f-caa0-4fb0-aa0a-559b0ba07857/pxl_20240705_002100833.jpg","rotation":0,"imageHash":"HQgKDoAXm4s8c4iQiUeZV5l2eqD2KZw=","imageWidth":2837,"imageHeight":2325,"__typename":"PrintImageType"},{"id":"3304912","filePath":"media/prints/933184/images/7117428_239df8ce-43f3-4c11-b791-2344fc8fb863_72b84f13-6899-4637-b8aa-26fe045b4440/pxl_20240704_233549196.jpg","rotation":0,"imageHash":"3gcKDoJEOJdwd4mYiIp4V6eH+Lx9+5o=","imageWidth":1853,"imageHeight":1572,"__typename":"PrintImageType"},{"id":"3304913","filePath":"media/prints/933184/images/7117430_5df10b4b-1d63-427c-8436-3fd79e99992d_825380c8-3056-4b9d-ae49-417864b7781c/pxl_20240704_234439097.jpg","rotation":0,"imageHash":"GggGBoLPaEakiIdViHd3qWd3428Et5Y=","imageWidth":2365,"imageHeight":2134,"__typename":"PrintImageType"},{"id":"3304915","filePath":"media/prints/933184/images/7117432_58168f52-2a6f-4e24-b813-f3a67eda3af2_f72be8ea-ddbc-4aa6-9a86-0eb7f13cb100/pxl_20240704_234609201.jpg","rotation":0,"imageHash":"HAgGBQKQiZ96SJP5eIuJuaD/W9y/","imageWidth":1959,"imageHeight":2684,"__typename":"PrintImageType"},{"id":"3304916","filePath":"media/prints/933184/images/7117429_273e9e20-1edc-49d3-b1ca-566290ad16ee_26baeacd-38eb-4546-8b44-ec39f68b77e8/pxl_20240705_003701596.jpg","rotation":0,"imageHash":"nSgKDYJjZ2hwiIabdfeJiNYDIJwC","imageWidth":4080,"imageHeight":3072,"__typename":"PrintImageType"},{"id":"4334994","filePath":"media/prints/0b4b5d38-2dff-46fe-8b90-83e39818c31a/images/9474820_561739d0-08a4-4b2b-9c2a-180669143e1c_ae558c76-ce8a-47d9-9006-e7aaf02db4fe/screenshot-2025-04-11-121218.png","rotation":0,"imageHash":"lRgGHoYYh4eGh3hwemeXeId5CImAkAg=","imageWidth":742,"imageHeight":656,"__typename":"PrintImageType"}],"imagesCount":7,"tags":[{"name":"light","id":"104","__typename":"TagType"},{"name":"lamp","id":"105","__typename":"TagType"},{"name":"head","id":"328","__typename":"TagType"},{"name":"model","id":"892","__typename":"TagType"},{"name":"socket","id":"934","__typename":"TagType"},{"name":"base","id":"2221","__typename":"TagType"},{"name":"headlight","id":"5184","__typename":"TagType"},{"name":"honda","id":"5525","__typename":"TagType"},{"name":"bulb","id":"5688","__typename":"TagType"},{"name":"sealed","id":"10167","__typename":"TagType"},{"name":"beam","id":"13317","__typename":"TagType"},{"name":"headlamp","id":"15268","__typename":"TagType"},{"name":"deluxe","id":"15435","__typename":"TagType"},{"name":"moped","id":"18681","__typename":"TagType"},{"name":"express","id":"22843","__typename":"TagType"},{"name":"1982","id":"46476","__typename":"TagType"},{"name":"1983","id":"61425","__typename":"TagType"},{"name":"replaceable","id":"63951","__typename":"TagType"},{"name":"urban","id":"67350","__typename":"TagType"},{"name":"nu50m","id":"227011","__typename":"TagType"},{"name":"nu50","id":"227012","__typename":"TagType"},{"name":"urbanexpress","id":"227016","__typename":"TagType"},{"name":"sealedbeam","id":"229603","__typename":"TagType"},{"name":"1157","id":"229604","__typename":"TagType"}],"thingiverseLink":null,"filesType":null,"previewFile":{"id":"3911635","filePreviewPath":"media/prints/933184/previews/76750f43-1ae6-47ba-95d1-df01662dfcb3.png","__typename":"STLType"},"license":{"id":"3","disallowRemixing":false,"__typename":"LicenseType"},"remixParents":[],"remixDescription":null,"easyprintProjects":[],"__typename":"PrintType","eligibleForNomination":false,"publishApprovalRequired":false,"publishRequests":[],"priceBeforeSale":null,"user":{"id":"340387","handle":"Ossum","verified":false,"dateVerified":null,"publicUsername":"Ossum","avatarFilePath":"media/auth/avatars/3f/3fb2dfcb-2e5e-40cc-9251-47ff069afe84.jpg","badgesProfileLevel":{"profileLevel":16,"__typename":"BadgesProfileLevelType"},"__typename":"UserType","isFollowedByMe":false,"isHiddenForMe":false,"canBeFollowed":true,"billingAccountType":"personal","lowestTierPrice":null,"designer":false,"stripeAccountActive":null,"membership":null},"contests":[],"contestsResults":[],"prusameterPoints":null,"latestContestResult":null,"referencingArticles":[]}}}