Update V2:

Revised this on July of 2023 to accommodate the included clip as the BTR5 is a slippery device by itself and QOL improvements! The design is now screw-less and is simply friction fit so you might need some taps with a rubber mallet! Edges have been fillet to eliminate sharp corners and added cavities/pits for adding weights. 

And of course you can remix it in Onshape here

Change list:

• Now screw-less!
• Now accommodates the included FiiO BTR5 clip
• Added fillet on sharp edges
• Added cavities/pits to add weight

Parts List for V2:

• x1 Male & Female Right Angle USB C Adapter (Get it here and pick style B: https://www.ebay.com/itm/295507316103)
• Optional:
  • Anything thing to add weight.
    • I used steel slingshot pellets/ball/ammo that I strangely have lying around.
  • Hot glue
    • For securing the weights from slipping through the cracks.
    • And for adhering the two half together if the friction fit pegs doesn't work out for you.

Assembly:

1. If you do not have weights then skip to step 2. If you do then continue below:
   1. Add your weights into the cavities/pits.
   2. Glue it down and wait for glue to solidify/harden/bond.
2. Add the right angle USB C adapter to the Lower Half.3mf part.
   1. Note: You could glue it down but I recommend against this as the looseness compensates for any errors in your print.
3. Snap the two halves together.
   1. You might need a little elbow grease or some persuasion with a rubber mallet.

V1:

Back in late March 2022, I was looking for an dock for my BTR5 to hold it upright on my desk and to my surprise, no one has designed one! So I took my caliper and some low level CAD skills then created this!

Note:
The pictures I posted here is an earlier version. I have made some slight improvements in the uploaded models.

Created on Onshape, remix it here!

Parts List:

• x1 Male & Female Right Angle USB C Adapter (https://www.ebay.com/itm/295507316103)
• x3 M3x8mm Counterbore/Panhead Hex Screws (Max head size: ~5.5mm for ref.)