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Many people are building machines they designed from scratch. Here is combination of CNC machine and 3d printer which is well documented with complete build guide. It has some interesting features like printing with many materials.

Here is 2BEIGH3 as CNC cutter slicing trough acrylic plate:



Here is 2BEIGH3 3d printing with Nylon (btw: printing Nylon emits toxic fumes, it should be done in controlled environment):

2BEIGH3 technical specifications:

• Build volume for CNCing: 14” x 14” x 6”,  355mm x 355mm x 160mm  
• Build volume for 3d printing: 14” x 14” x 12”, 355mm x 355mm x 355mm
• Material Aluminium 3mm or 0.125" ABS and PLA Plastic Rod or Line
• Plastics 2-3mm(or 0.125") Nylon, Nylon Polymers, Nylon 6 and 6/6 - 6' Rod
• Foam 3mm or 0.125" PET (Plastic from water bottles)
• (Steel with the addition of cooling) 
• Resolution: X-Y Resolution +/- 0.005 ~ +/- 0.012, Z Resolution +/- 0.005 +/- 0.005
• Cut/Print Speed 350mm/min 24mm/s
• Cutting Foam ABS
• Tools/Tips 0.125” – 0.250” .32mm - .62mm

Software:

• Any CAD that makes “.dxf” and exports “.stl”
• MACH3
• LazyCam slic3r rev 6
• PC Win XP

This hybrid can print with various materials like ABS, PLA, different nylon polymers, acrylic and It can also print with reclaimed PET from the regular PET bottles. Here are the images of printed objects in different materials:



Here is a video of it printing in clear acrylic:





Hot end is also custom designed from simple parts:



























All the details need for construction of 2BEIGH3 can be found here:

http://www.instructables.com/id/Combination-CNC-Machine-and-3D-Printer/?ALLSTEPS

This looks cool. Maybe I'll find a laser cutter (which is not the easiest task in rural Croatia) in the future and try to build it. I wonder what are the heat retention impacts on print quality ...











From project description:

A modified version of the Mendel90 which uses a lasercut melamine coated MDF frame (same fixing idea as the graber i3 frame). It allows an acrylic enclosure to be fitted. 

Main changes:
Frame re-designed, Z axis changed to laser cut parts.
Some plastic parts modified (not many)
Acrylic enclosure added
Wiring simplified - all motors have detachable plugs, endstops are push fit. this allows for a wiring loom to be used.
RAMPS electronics as standard with the Panelolu2 controller.

All the detail is available on our blog:
http://blog.think3dprint3d.com/2013/09/mendel90-laser-cut-ready-to-print.html
The assembly process in more detail in in this post:http://blog.think3dprint3d.com/2013/10/mendel90-lasercut-overview.html
The commissioning and calibration in outline is here:
http://blog.think3dprint3d.com/2013/10/mendel90-lasercut-calibration.html
The printer is designed from the start to take multiple bowden extruders as an alternative to a single direct drive extruder. Updates will follow!

Files available at:

http://www.thingiverse.com/thing:169615

Project by: http://www.thingiverse.com/Think3dPrint3d/designs