TK300 by RockyShi is on Thingiverse now ... information may be limited, design looks sturdy, it is made with steel side plates and CNC aluminum connecting parts ...
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From Thingiverse description:
Dual extruder version:
http://www.thingiverse.com/thing:212131
Base version:
http://www.thingiverse.com/thing:212115
From Thingiverse description:
- Ultimaker main board, will change to Rumba soon
- dual DD2 extruders, direct driving
- dual metal hotends E3D with cooling fans,Fast heat up
- lcd controller
- use prontface,cura or other opensource software
- 1.75mm ABS or PLA filament
- Fast change filament function
- Steel cabinet for power supply and electronics
- Borosilicate glass
- Mk2a 300mm pcb heatbed with 24v,can reach 140 centigrade
- building size 300*300*320mm
- layer thickness 0.1-0.4mm
- Steel side plates
- CNC aluminum connecting parts
- Modular packing
Dual extruder version:
http://www.thingiverse.com/thing:212131
Base version:
http://www.thingiverse.com/thing:212115