My wife needed a mounting bracket to mount her Zildjian Gen16 cymbal brain on her Roland TD-25KV drum kit. We couldn't find one that would fit perfect, so I made one inspired by some other designs we found online. The uploaded .STL files here are for mounting on a 38mm frame, and the post for the brain is 19mm.

Update: I've made some minor cleanup of the Fusion file, and rather than linking to the AutoDesk site, I'm just going to upload the file here. Hopefully it works ok, let me know if there are any issues with this. The design is fully constrained and parameterized, so should be easy to modify the diameters and a few other details as needed.

Using

This simply slides on the Roland frame, and clamp it down with 2x 5mm bolts. The device, in this case the Zildjian Gen 16 brain, slides down in the smaller hole. It will also clamp in with 2x 5mm bolts.

Even though this model was specifically made for this drum kit, I think the overall design can be used to mount anything with two different angled (90º) mount posts.

FDM Printing

This can be a little tricky to print well on an FDM printer. No matter how you place the model, there will be severe weaknesses if any of the clamps are parallel with the layer lines. I tried this, and it simply will not hold, and will break on the layer line under pressure. Therefore, I've also made a model available where it is split into two parts (see pictures). 

For this, it's simply

1. Print the two models oriented such that the layer lines are orthogonal from the clamps (see pictures).
2. Use the alignment holes to orient the models.
3. Glue them together, ideally with an epoxy. Super glue may work, but I didn't try it and not sure I trust it.

This makes for a very strong model, that will hold all the weight easily and will not break

SLA Printing

I also tested printing this, standing up, on one of my SLA printers. This worked surprisingly well, using the Phrozen Onyx 410Pro resin. This resin is expensive, but it is incredibly strong and somewhat flexible. I've tried hard to break the two clamps, but have not been able to do so.

I'm providing the pre-supported model as well, which is how I printed mine.

I didn't try it with any other resin, but if you use something else, make sure it's not a brittle resin. I'd recommend adding Siraya Tech Tenacious to other ABS like resin, which should help making a somewhat flexible clamp. I didn't try that, but I would venture a guess that 20-30% Tenacious will make for a strong print.