Shortened modification of BoiBoiCleetus567's simple thumb drive. Had to shorten for the tiny SLT2 transmitter because the wheel is closer to your thumb. There is a monogram-less version and a version where you can modify the text_shape attribute of the object to change the letter. I had a color change at the layer that the letter appears and just continues with that same color for the rest of the print…you'll never see that anyway, since it's hidden under the wheel.

There is also a little template that you can use to cut skateboard grip tape (hiiiiighly recommended) or foam tape to make the little knob a lot more grippy.