Case Handle for MTS 1207V Medium Size Tuba Case

Simple replacement handle for MTS 1207V Medium Tuba case.

Pictured is the undamaged handle (Original/OEM) as well as the printed model (Embossed "Music Center SD" text added in slicer) in White Polymaker PLA Pro.

My son's school instrument had a broken handle. I am very new to CAD, so this is a very simple model. Room for improvement for sure, recommend ~4 walls, ASA/ABS. The first test-print in Polymaker PLA Pro actually worked pretty good, but not worth dropping the tuba!

The handle assumes you re-use the mounts screwed into the case and the roll-pins that secure the original handle.

To get the roll-pins out, I removed the hardware from the case altogether (2 screws under the lining for each). I used a tap to add M3 threads inside the pins, then used a small socket + washer + m3 screw to create a make-shift puller. It worked on one. On the other, I used a dremel to cut up and remove the remaining handle bits, then used pliers to push the pin out. The pin ID for that one seemed just a touch larger, where the M3 threads could skip and the "puller" didn't work.

Once the pins are out, assembly is just securing the handle base to the case again, then lining up the handle and re-inserting the pins.

For a truly human-replaceable part, you could thread the original mounts, and maybe use a metal sleeve to protect the threads.

I might revisit this model for a V2, and I will add some more features to make it easier to service after the initial fix. (Threads and sleeves and so on).

Hopefully this helps! Please feel free to reach out if you find an issue or need a modification to better suit your case. I'm considering making a parametric model so it can be used on a lot of band instrument cases. Let me know if that would be helpful, and give me whatever model/picture/data you can about your specific case!