Improved Meduza belt gearbox

This is an improved designed of the excellent Meduza gearbox for the Ultimaker 2

3D printer parts and enhancements

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    Based on original design: Belt Geared UM2 Feeder Upgrade by Erik Cederberg


    The great Meduza belt geared feeder upgrade had a few minor drawbacks that I set out to improve. This version is completely remodelled, so it is not identical nor compatible with Meduzas design.

    I use this gearbox with iRoberti's feeder and I have printed some 1000 hours with it.

    Compared to the original design this features the following improvements:

    *Longer slots for screws to allow for more adjustment as well as using a 16T pulley for a 2.25x transmission rather than the 1.8x of the original.
    *The base is 0.5mm thicker so that the inner bearing doesn't damage the back of the printer.
    *Permanent cable retention clips.
    *Screws on the top plate have been recessed so that the arm of the iRoberti feeder can be fully extended.
    *Holes for the nuts have a chamfer so that they can be printed without supports.
    *Holes in the top plate for access to the screws are larger.
    *Deeper holes for the two nuts in the top plate as they where tricky to keep in place while fitting.

    I have also included a step file for anyone who wants to modify the design.

    This design requires the following hardware.
    *16 or 20T pulley (I use 20T)
    *36T pulley
    *5mm rod that is about 25mm plus the thickness of the feeder (for iRoberti that would be about 40mm) but can be longer.
    *55t 110mm gt2 belt
    *2x MF695 or F695 flanged bearings
    *2x M3 screw 10-20mm
    *4x M3 screw 12mm (10mm or 14mm might work but only just)
    *4x M3 screw that is 6,5mm plus the thickness of the feeder (for iRoberti that would be approx. 20mm) and at most 10mm longer than that.
    *6x M3 nyloc nuts
    *(Optional) 1-2x 5mm washer next to the 36T wheel to prevent movement.

    Materials and methods

    When printing the top part, supports must be activated. In Cura they should not be generated for the holes in the bottom part so they can be printed together. Included is also a spacer that can be inserted after the nut to keep it from falling down.

    Parts will have to be rotated so that the flat side is down.

    I have printed this with fairly high infill to give extra strength.

    PLEASE NOTE. Check the orientation of the part and mirror to suit your needs.



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    F77664944d69a98a1027a8327d54ec7c?default=blank&size=40my3d added this to the UM2 collection ago
    51d182ced9e0d0efff5b4c72bddad7eb?default=blank&size=40maccew added this to the 3dprinter collection ago
    60c8691cedfcf939fc352716b43d5248?default=blank&size=40Chris Branson added this to the Printer Parts collection ago
    Mini reiner 001 2Reiner Bühl added this to the Ultimaker2 collection ago
    Mini avatarJonatan Rullman published this design ago