This is someway a rework of a previous thing I published (https://www.thingiverse.com/thing:2945783), but only the carriage and not the other parts.
It was modeled using Freecad but that didn't give me the opportunity to change parameters so I made this one using Openscad, so it can be used on printers with different X rods interaxis.
The carriage is good for printers with horizontal axis layout like on my modified Geeetech printer.

The extruder setup is just a 45mm throat with heating block, using as heatsink a few washers. It works very well, and it is very compact, allowing more printable area on the X axis. It can be just as wide as the bearings, allowing me to get 20mm extra in print width on my printer.
The top side of the throat is jointed to an M6 tube fitting using just an M6 nut.
The case for the extruder mount a 40mmx40mm cooling fan.

I mainly redesigned this carriage because I need to implement some attachements and I want to make them modular and as compact as possible.

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I created these eBay links where you can find components, filaments and spare parts at the best prices. These are just links to eBay and Aliexpress items, where I normally buy spare parts and materials for my printer and projects. Clicking on these links will support a little bit these projects.

PCB perforated boards - Resistors eBay - Capacitors eBay - Diodes eBay - led - Wire terminals eBay - Arduino and modules eBay - Raspberry and modules

Prototype PCB board Aliexpress - Resistors Aliexpress - Capacitors Aliexpress - Diodes and LED Aliexpress - Arduino and modules Aliexpress - Raspberry and modules Aliexpress

PLA Filament - eBay - ABS Filament - eBay - TPU Filament - eBay - PET Filament - eBay

Complete extruders - eBay

Heat blocks and heaters - Aliexpress

Standard nozzles - eBay - Standard nozzles Aliexpress

Volcano nozzles - eBay - Volcano nozzles - Aliexpress

GT2 pulleys - eBay - GT2 pulleys - Aliexpress

GT2 belts - eBay - GT2 belts - Aliexpress

Linear bearings LM series - eBay - Linear bearings LM series - Aliexpress

NEMA 17 step motors - eBay - NEMA 17 step motors - Aliexpress

3d pen - eBay

100$-200$ 3D printers - eBay - 100$-200$ 3D printers - Aliexpress

200$-300$ 3D printers - eBay - 200$-300$ 3D printers - Aliexpress

300$-500$ 3D printers - eBay - 300$-500$ 3D printers - Aliexpress

500$-1000$ 3D printers - eBay - 500$-1000$ 3D printers - Aliexpress

1000$-2000$ 3D printers - eBay - 1000$-2000$ 3D printers - Aliexpress

2000$ - 5000$ 3D printers - eBay - 2000$-5000$ 3D printers - Aliexpress

Filament extruding machine - eBay -
Filament extruding machine - Aliexpress

Pellets for extruding machine