Shame on me, I didnt have yet written about the C4CPC which is for the Amstrad CPC+ and GX4000 cartridge port what the HxC drive emulator was for the disk drive. It is created by Gerald.

BEWARE, using the C4CPC with a GX4000 console and its original alimentation will give you a nice clipboard, for the explanation, it's here.

And of course, with 3D printing, some people went for it to make a C4CPC cartridge with a better look :

• Box/Case per C4CPC (Amstrad GX-4000)
• Retro Special - C4CPC: 3D Printed Case Assembly
• Printing an Amstrad Plus C4CPC cartridge case

Nocart v1.4 for windows will let you convert Amstrad CPC programs in a .CPR file (cartridge image) usable on the C4CPC. Beware, some programs wont work : the keyboard will not work, it means the game must be patched for CPC+ firmware.