This article is for advanced users, professional makers and commercial use.
For advanced 3D printer users, the most important factors to consider are print volume, materials support, quality and support. For commercial use, stability and high success rate are really essential.
Most 3D Printer users start with FDM Printers and the may consider upgrading to SLA/DLP Printers. Yet SLA/DLP printers normally require more complicated post-processing and the materials are generally more expensive. In fact, a lot of FDM 3D Printers can produce excellent quality and can be used for production with simple post-processing.
Below are some advanced desktop grade FDM 3D Printers. They have larger print volumes, plug & play and heatbed. Moreover they also support most FDM Printing Materials.
CraftBot 3D Printers was voted as the Best Plug and Play 3D Printerby 3DHub users for 3 consecutive years. Even beginners can start using it without any difficulty. CraftBot XL provides a large print volume of 30cm x 20cm x 44cm with a 50 microns layer height. The printer is extremely stable and can be used for heavy duty usage.
CraftBot Flow Generation is the newest series and extensive features have been added to the solid foundation built from previous generations. It also offers a strong commitment of 5-year warranty. CraftBot Flow Generation has a Single Extrusion  version and an independent dual extrusion IDEX version. In fact, CraftBot Flow IDEX XL provides the biggest print volume amongst all IDEX 3D printers in the market.
Mosaic Palette enables you single extrusion 3D Printer to print in multiple colours/materials simultaneously. For existing 3D printer owners, it provides a lot more creative flexibility in a very affordable price.
Zmorph FAB Multi-tool 3D Printer is the best choice for professional makers or designers who wants more than 3D printing with plastic. It's unique toolhead design allows you to easily turn the 3D printer into a CNC and laser engraving/cutting machine. Apart from plastic, you can now create masterpiece with a wide range of materials like wood, card board, leather, etc.
Many advanced users like to use composite filaments like wood, carbon fibre, stone or even metal. These composite filaments are normally abrasive and can cause damage to nozzle which affects print quality. Olsson Ruby nozzle has an extremely hard internal structure with a brass exterior for excellent heat conductivity. It allows users to print any type of materials without worry.