01._Principles 02._Frame 03._Linear Motion 04._Extruder 05._HotEnd 06._Electronics 07._Assembly
In Fab Lab Leon we decided to make a 3D printer protoype, and we chose the
Rostock REPRAP model as the starting point,
because of its beautiful setup and movement and its big Build volume: 200x200x400 mm:
This prototype is a
Delta Robot, wich is a type of parallel robot
that consists of three arms connected to universal joints at the platform and carriege.
The universal joint is a kind of joint or coupling in a rigid rod that allows the rod to 'bend' in any direction:
The key design feature is the use of parallelograms in the arms, which maintains the orientation of the end effector
in our case the platform for the Hotend extruder for the plastic filament.
Enclosure at the base and top frame: 19 mm MDF board, cutted in CNC with a 6 mm end mill:
The base is designed to contain the power suply and the electronics.
Also several holes are made to place several propellers to ventilate properly that volume, and to reuse the heat
coming from the electronics to the hot bed:
Fasteners: mostly M3 (some M4 and M8)
Timing belt: 3x 1524 mm GT2 belt (2 mm pitch)
Timing belt pulleys: 3x GT2.5 plastic pulleys with 32 teeth. Printed in ABS from
here
Drive rods: 6x 762x8 mm stainles steel precision smooth rods.
Linear bearings: 6x LM8UU
Ball bearings: 3x 608ZZ, 3x F608ZZ.
As extruder we printed a version of the
Jonas Kuehling bowden extrusion system for a 6mm tube, based on
Gregs Wade extrusion system:
Printed in ABS from
thingiverse
The extruder and the hotend platform are not placed together, instead we will place the extruder at the top
of the structure. And then we will join the two parts with a 6mm tube with the plastic
filament inside.
This is the extruder mounted:
We buyed a version of the
Budaschnozzle made here in Spain.
The Budaschnozzle 1.3 is a high performance hot end for use with RepRap and other 3D printers.
The hot end comes completely assembled: you wire it to your electronics and it is ready to print.
The hot end is placed bellow the Platform as shown in the picture:
On top of the platform we need the Hotend holder, in the picture bellow you see the different parts needed:
And the hotend holder mounted on top of the platform:
These 3D printers use RepRap Arduino Mega Pololu Shield
RAMPS
wich is a printable circuit board that fits on the Arduino MEGA and holds interchangeable stepper driver carriers
and the rest of RepRap's electronics.
This is an schematic of the wiring:
Our Idea is to make a Fabable 1-sided RAMPS and build a Fabduino MEGA, making a modular system
wich is compatible with the existing firmware.
The modules will be:
.-3 Plug in stepper drivers .-1 Extruder control electronics .-3 Endstop module .-Heating module for the Hotend extruder heater and the Heated Build Plate .-Thermistor module for the Heated Build Plate and the Hotend extruder heater .-Power suply
Next I place some pictures of the assembly process:
The printed parts in ABS:
The Rostock parts placed in order:
Carriage:
Idler end:
Motor end:
Platform:
And the state of the art:
