December 1, 2025
Description
This device is designed for children ages 1-8 to build mobility, independence, and social skills.
YOU MUST READ AND AGREE TO ALL OF THE TERMS AND CONDITIONS AT https://www.3dmobility.org/terms-and-conditions/ BEFORE USING THIS DEVICE!
JOIN OUR MAKER / FAMILY MATCHING PROGRAM AT https://3d-mobility.org/
UPDATE 2026 06 15
Revised ‘REV C’ Front caster mount - easier to install
Changed standard TPU 95A tire setting to: 3 walls and 20% infill. Harder tires gave users a smoother ride
UPDATE 2026 04 25
Revised orientation for the front caster mount.
Replaced 4-part wheel with 2-part wheel. 4-part rim still available at end of build plates.
Added 1-part footrest for both XPA and H series, also shown at the end of build plates.
Added 3D-printed washers to build plates instead of using metal washers.
UPDATE 2026 04 22
Minor Adjustments to the lower push handle to make sure the headrest screw does not hit the handle.
Current file is: 3DTMT XX PUSH HANDLE BOTTOM REV B V3. Both XPA and H profiles updated.
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UPDATE 2026 04 12
REV B RELEASED! This revision encompasses minor but important changes:
New Front Caster Mount
New Push Handle Bottom
New Push Handle Braces
New Headrest
New Headrest Screw
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We are also releasing KIT hardware and filament for all VETTED makers on 3D-Mobility.org. USA ONLY
You can now purchase the $25 KIT (hardware only) or $100 KIT (hardware + filament).
NOTE YOU CANNOT MIX KIT CASTERS WITH SELF-SOURCED (McMaster/Amazon) CASTERS!!!
The updated REV B profiles also reflect these changes related to the KIT:
Additional Plate for the Rear Caster Mount for KIT hardware.
Plate 10 on X/P/A Profile & Plate 8 on H series profile
Additional Plate for TPU 98A tires (TPU 98A will be included in the KIT, print TPU 98A tires at 6% infill)
Plate 27 on the X/P/A profile & Plate 19 on H series profile
Note: All other TPU parts remain unchanged between 98A and 95A
Build sponsoring will be turned on in the coming couple weeks as we get this process underway.
Rear caster available on amazon - https://amzn.to/4xgCRgy - use with this print profile - https://makerworld.com/en/models/2923623-caster-mount-for-amazon-casters#profileId-3271903
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Update 2025 12 04 -
Some users report bed warping on the front part of the ‘Handle’ files. This leads to a gap when fully assembled. I have updated the print profiles to include a 10mm brim for these parts! -Noam
This project is designed to be printed on all Bambu Lab printers (except the A1 mini). It takes 10-13 days.
It will work for any printer with a minimum bed size of 256mm^3
It will use around 8 spools of PETG (budget for 10 in case of any failures) and around 3 spools of TPU depending on whether you print the cushions.
We recommend FOAMING TPU for the cushions, see instruction manual for more information.
Please use the pre-sliced files, as they have been optimized for minimal supports and maximum printability. Use a bed adhesive to ensure the large parts do not warp. All STL, STEP and SOLIDWORKS files have also been provided.
DO NOT MODIFY THESE FILES! This design has been through rigorous testing. Modifying the geometry may cause failures, assembly issues, and user injury. DO NOT MODIFY THESE FILES!
.4mm nozzle REQUIRED for TPU straps
go to 3D-mobility.org for more information including: links to our forum, volunteer sign up, request a chair, instructional videos, and more.
DOWNLOAD INSTRUCTIONS and FILES HERE: https://bit.ly/4pBFXHk or on 3D-Mobility.org
Full build videos can be found on the MakeGood YouTube - https://www.youtube.com/@MakeGood.Design
WE WANT TO SEE YOUR BUILD! Please post them here or on 3D-Mobility.org
If you post your build on social media - Tag us! We will reshare to our followers!
https://www.instagram.com/makegoodnola/
https://www.facebook.com/profile.php?id=100068870911818
https://www.tiktok.com/@makegoodnola
Design/Printing feedback? Let us know on this platform!
THANK YOU AND HAPPY PRINTING!
-Noam, MakeGood
This project is a collaboration between MakeGood, TOM Global, and LINK PBC. Check out these awesome partners as well:
Want to have a Mini-TMT to go with the big one? Check out this brick-sized model by LINK -
https://makerworld.com/en/models/2068868-3dtmt-mini-brick-scale#profileId-2234307
i must give credit to MakeWorld user @squinn, this design uses his excellent snap buckles
License:
CC0
MakeGood
