{"data":{"make":{"id":"2958449","created":"2025-11-04T20:00:00.414571+00:00","edited":null,"deleted":null,"isMake":true,"printer":{"id":"761","name":"Prusa CORE One","__typename":"PrinterTypeType"},"parent":null,"author":{"id":"3343079","handle":"BuffaloForge_3343079","verified":false,"dateVerified":null,"publicUsername":"Buffalo Forge","avatarFilePath":"media/auth/avatars/90/90b07267-bef1-4dd2-9721-82e6891a7477.jpg","badgesProfileLevel":{"profileLevel":12,"__typename":"BadgesProfileLevelType"},"__typename":"UserType"},"images":[{"id":"2813689","filePath":"media/comment_images/ee/227c75-8793-4545-887e-11da91bf570e/img_9244.jpg","rotation":0,"__typename":"CommentImageType"}],"mentions":[],"text":"This is such a worthwhile upgrade to the Core One. Easy to print with the Core One (I used Easy PC CF) and the parts work a treat. I've been using some flexible filaments and this mod makes the printer handle them well.","rating":5,"likesCount":0,"liked":null,"membershipAgeMonths":null,"modelData":{"model":{"id":"1072020","ratingAvg":"4.8888888889","ratingCount":36,"__typename":"PrintType"},"__typename":"ModelDataType"},"membershipTier":null,"__typename":"PrintCommentType","model":{"eligibleForNomination":true,"id":"1072020","slug":"mk4s-bogie-idler-main-plate","name":"MK4S Bogie Idler & Main Plate","authorship":"remix","club":false,"excludeCommercialUsage":false,"price":null,"eduProject":null,"ratingAvg":"4.8888888889","myRating":null,"ratingCount":36,"description":"

Updates

25-10-22

\u201cIdler_6-7_R3\u201d dimensions adapted to the Main Plate R4 with angled Swivel. This update is more angled than the previous design to align the screws horizontally and minimize the screw tread friction in the heatsink.

\u201cMain_Plate_9-10_R4\u201d have tighter tolerance to the Gear and modified filament guiding at exit to the nozzle.

\u201cIdler_1-2_R2\u201d have some minor changes

\u201cIdler_1,2,11_R2B\u201d is optional. it's an alternative design to \u201cIdler_1-2_R2\u201d with a stronger beam between part 1 and 2.

Changed material from PETG to PCCF.

Printing

Printing on MK4S. Material PCCF. Nozzle 0,4 and layer 0,2. I use original presetting\u2019s for Prusament PCCF structural except for part 1-2 where I changed seam position to nearest.
The design requires fine tolerances. Check your x-y belt tension and use dry filament.

Idler assembly

The numbers refer to the pictures. No glue is needed.
Press bogie parts 1&2 together. Place original bearings 3 (693 2RS) into the bogie and press original pins 4 (3x8.5) in place. Fix a nut 5 (M3) in the idler lever 6. Place the bogie assembly between idler lever 6 and 7. Tighten firmly with screw 8 (M3x6). Don\u2019t overtighten the screw! Push the original tubular spacer 9 (13.2x3.8x0.35) into 6 and 7.

Main Plate assembly

The numbers refer to the pictures. No glue is needed.
Press together part 9 and 10. Check that the total height of the filament guide is not exceeding 10 mm (see picture). The two parts will keep together when assembled in the Nextruder.

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Enhance your Prusa 3D printer with spool holders, camera mounts, LCD covers, fan shrouds, and more, including the Lack enclosure \u2013 all designed to optimize your Prusa CORE One, MK4, XL, MINI, MK3S+, SL1S, HT90 and more.","__typename":"CategoryType"}],"__typename":"CategoryType"},"modified":"2025-11-16T23:28:14.049205+00:00","firstPublish":"2024-11-13T16:23:44.745864+00:00","datePublished":"2025-11-16T23:28:14.021439+00:00","dateCreatedThingiverse":null,"nsfw":false,"aiGenerated":false,"politicalContent":false,"summary":"Bogie design of the Prusa MK4S idler and main plate with improved guiding of the filament. 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From the original Prusa MK4S STL files I made a reverse engineering of the Nextruder main-plate and the idler. When you look at the Idler you get the impression that the two bearings distribute the pressure evenly as they push the filament against the gear. In fact, only the lower bearing is pushing the filament against the gear. This causes very big pressure on the filament. For hard filaments this is not a problem but flex filaments is smashed. This mod is a \u201cnice to have\u201d for hard filaments like PLA and PETG and \u201cmust have\u201d for soft Flex filaments.

I also noticed that the screws holding the Idler-swivel assembly rub against the screw holes in the heatsink and cause friction. In this latest update the Idler-swevel is angled down to reduce the screw friction in the holes.

The new bogie design of the Prusa MK4S idler distributes the pressure equal on the two bearings and the filament. The Idler only has guarantied function together with the modified Main Pate!

Regarding the Main Plate there are similar designs to improve guiding of the filament. This Main Plate have geometry adapted to the Bogie Idler. It consists of two parts that are put together witch makes printing of the parts easier and the quality of the Main Plate better.

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MK4S Bogie Idler & Main Plate

MK4S Bogie Idler & Main Plate

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