After the typical time of pre-production, in which there is naturally little to report about outward visible successes and progress, ...
We are excited to be able to finally publish first details on our new RepRap design after a full year of development. As we mentioned earlier we went the extra mile and started from scratch instead of modifying an existing design in order to incorporate all features we desired.
This is a true RepRap. An open source 3D printer that can print its own components by Fused Filament Fabrication from materials like ABS plastic. Nearly all additional unprinted parts are either standard parts (steppers, nuts, bolts, washers etc.), flat sheet material that is cut into rectangular pieces and drilled (acrylic and wood for the case, aluminium composite board for bottom of print bed), or extrusions and shafts that are easily cut to length with a chop saw.
For us it is very important to mention that we have incorporated a lot of good ideas from the great diversity of existing RepRaps into our design that we want to highlight as we’ll further document more details over the coming weeks.
By the way all printed parts for this prototype were printed in ABS on our very first, handcrafted RepStrap we built from scratch mid 2011. But now let us show some fotos – for a feature-list and upcoming developments see below:
- Specifically aimed at printing ABS with zero warping, low maintenance effort through highly accessible sub assemblies
- Rigid frame made of 20x20mm t-slot aluminium extrusion
- Fully enclosed by acrylic and wood, doors on the front
- A heated chamber capable of 65-70°C recirculating air temperature
- Heated PCB print bed
- Water cooled hot-ends and extruder steppers to ensure reliable extrusion in high ambient air temperature
- Fully parametric design in OpenSCAD
- Dual extruders, primarily for use with different nozzle diameters for perimeters/infill to save printing time on big objects (we are testing with 0.35mm for perimeters and 0.75mm for infill at the moment)
- 3mm filament diameter
- Compact, rigid parts with integrated mounting points for endstops and such
- Activated-carbon air filter to remove unpleasant smell of molten plastic
- Cable management
- Semi-automatic print bed levelling makes calibrating the machine a matter of seconds
- Z-leadscrew bearing supported on both ends, sugru spider coupling for absolutely wobble-free operation
- 12mm precision ground shafts with LM12UU linear ball bearings on all axes (will be replaced by Igus RJMP, see below)
- Tool-free belt tensioning with built-in thumbwheels
- Direct-drive extruders with high torque geared stepper motors
- Permanent printbed material (FR4) – no Kapton or PET tape needed
- Adjustable nozzle height to align both extruders on the same level
- 200x200x200mm build volume
- Custom designed, precision extruder drive gears to provide enough grip on the filament in a heated enviroment
- Integrated LED lighting
- Hotends from reprap-fab.org with 40W each for short heat up time
- RAMPS 1.4 controller board – we will give the R.U.M.B.A. a try as soon as it is delivered.
- Modular additional MOSFET driver boards for lights and fans
- Brand new high power 15A MOSFET driver boards (still in development by carbonfrog) for chamber heaters, total power >550W
- ATX power supply 1000W
- Water cooling based on a EHEIM/Innovatec PCPS1104 water pump
- Raspberry Pi with a 10″ capacitive touch interface for ethernet enabled standalone operation
- Touch optimized user interface for the raspberry pi is in development
- The frame will be revised for 30x30mm extrusions, so we can use T-slot nuts that can be swivelled in, providing much easier assembly. These nuts are poorly available for 20x20mm extrusions
- All LM12UU linear ball bearings will be replaced by low maintenance Igus RJMP slide bearings that are rated for continuous use in 90°C ambient temperature
- Magnetic door locks