I’ve designed and printed myself a travel case for the PiFi kit, which can be found on Maker World at the following link: Raspberry Pi 4B Case (for Pifi)
I thought I would share here as well, as I figure the overlap between DIY travel Router folks and those with 3D printers might be high.
So far so good, I’ve left it plugged in for about a day, and i can’t feel any significant amount of heat - that being said, i haven’t had a chance to travel and run it with a VPN yet, so we’ll see.
If/When I do, if the heat level worries me, I’ll probably redesign to include a common RPI fan.