I couldn't find a good 3D printable case for my new Heltec V4 Meshtastic node which can fit a 18560 battery - until I found a comment in the model for the V3.
The user mentioned to remove 2 two parts in the center frame part. So I imported the STL in FreeCAD, removed the 2 parts and voilà! It fits!
Oh - stupid me: I should have taken another photo from the bottom before assembling. The removed parts are on the other side.
The first on is the rib under the display which would block the GPS connector and the second one are the two edges which are places under the buttons.
Update: Forgot to link the comment/make which explains this: https://www.printables.com/make/3157001
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