I recently bought my first Hornby HM7000 Sound Decoder for a Hornby OO Class 50 Diesel Loco, when I bought it I purchased the power bank for it.
When I went to fit none of the enclosures really worked with the power bank. The largest one available was great but left no room for the power bank so I drew a smaller enclosure for the speaker but with an area to sit the power bank. This is the design I came up with, It fitted perfectly in the loco and the sound still works really well. So I thought it was worth sharing for other people to use.
I have included a STL file with the supports added so you can use it to print or see the best orientation for printing.
For printing I would recommend it gets printed on a 3D resin printer.
If you like my designs then please would you support me through my Patreon account - https://www.patreon.com/PJD1974, any money raised helps me research, design and develop new items for me to share. For £1 a month you will give me basic support and for £4 you will get insight into my new designs and be able to contribute with my future projects.
If you would like a particular item that isn't listed here, you can request for me to do a project for you via cgtrader.com. Please be realistic.