I just imported the 2 stls in blender
put them together, like in the same place as you wanted
Selected both as seen in the image, then File -> export -> STL. Make sure you have "selection only".
Export it, open it in your favorite slicer, and that should work.
Blender can do a lot, I use it to design and modify a lot of things from thingiverse too, and I have learned a lot of tricks on blender too.
I also want to learn freecad to do stuff from scratch, but in the meantime blender does what I need.
EDIT: Most probably I did not understand the requirement correctly, is this supposed to have a hole? hit me up if you want, happy to help https://discord.com/users/poringo#6290
I lose my phone inside my house all the time, so I created a working prototype of a button connected to the wifi, and upon pressing it, my phone will ring for me to find it.
Woke up thinking how to design a 3d printed case for it so I can use a regular mechanical keyboard switch, and now I am too revved up to sleep. And I can't work on it on the pc, don't want to wake up everyone as it is 4 am here.
I have several books cases and shelves where I store books, this has helped me a lot to have a catalogue of them.
I just scan the book code, the app gets book info, and I assign it to a place where it is physically stored, like, bookcase 1 in office room, shelf 3 on main room, etc.
I have it installed from Droid-ify which is like an app to have more sources for f-Droid.
I have been curating my experience on lemmy by muting communities I don't care for like politics, sports, some Linux communities, and also I always filter NSFW.
I have never been happier because I don't see what I don't care for.
I played Rogue Legacy 1 and 2 for the longest time. Some dead cells. Enter the gungeon, and currently testing the humble roguelikes bundle, really digging Wall World.
Love me for what I am, by Carpenters.