This will be a fairly long post as it has more detail and more revisions
to the process. I just attended a 3D Printing/materials presentation by Allen
McAfee of FabLabs/Sandbox3D which made me reconsider many things and reaffirm
my choices in other areas.
As a full update to the Multi-use FabMachine:
2nd Derivative of the Snowstock printer, which itself was
derived from the Wolfstock
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1000mm tall 2040 V-slot extrusions
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1000mm tall 2020 extrusions as a vertical support to the
upper rails and extra space
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485mm horizontal 20/20 black anodized extrusions
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V-slot wheels
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Belts are in the internal extrusions to reduce amount of
stretch and wear due to heat
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Cherry Pi IIIS derived Spherical Spectra String mounted
effector for precision and no backlash (3S)
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Hotend is undecided (E3D Chimera Volcano, Kraken)
o
All-metal
o
300C capable
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Automated Tool Changing via electromagnetic kinematic
coupling on the effector
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cross bracing 500mm 20/20 black anodized extrusions
to resist torsional loads
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Hidden- Rotating tool holder on the X-braces to maximize
build area
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2 Watt Laser cutter/engraver
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Multi-Syringe Extruder
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Large Pick-n-place for mounting electronics, Auto-ejection
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Multi-Cylindrical Tool (Pencil, Pen, X-acto Knife, Sharpie,
conductive ink pen)
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Recirculating Carbon filter and HEPA filter
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Heated Build Chamber (at least 50C)
o
24V Ceramic Heater mounted to the upper portion to increase
chamber temperature
o
R-tech insulation to reduce heat loss
o
Sound Dampening panel
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Metal panel to increase rigidity
o
Polycarbonate Door with electromagnetic latch
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Water cooled system
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(5 Steppers (min.))
o
SSR Relays watercooled
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Smoothieboard watercooled
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Hotend(s) watercooled
o
120mm Radiator mounted above
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Blower fans air funneled in via tubing for layer cooling
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Out of filament detector with automated pause and growl
push notifications via octoprint
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Built-in Octopi with Raspberry Pi 2
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RGB lights mounted behind 2040 V-slot extrusions for even
lighting with light change depending on machine state(On, Heating, At temp,
Printing, Cooling)
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Dual Synchro Gear Float Extruders
o
# of extruders still undecided
o
Using a TB6600 Stepper controller to control a High torque
NEMA23 for high speed and torque without resorting to gearing.
o
Hobbed pulley geared 1:1 to have more contact on the 1.75mm
filament
o
Extruders float above the effector via a counterweight
pulley system with spring tensioned connectors to carriages to resist the
momentum changes due to high speed effector
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Microswitch Auto-calibration and bed leveling
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Astroyn Dampers
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400mm Build plate
o
16" Mic-6 8mm thick aluminum plate (tolerance
.005") for build plate
o
Build plate is a .003" PEI sheet to remove the need
for additional adhesive
o
24V 400 Watt Silicon Heater
o
Mounted with 3 point magnetic Kinematic Coupling with 10
micron repeatibility (Proven by MIT thesis by Raymond Ma that kinematic
coupling is the absolute best way for repeatability.)
o
XT60 Connector for disconnecting buildplate
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Soluble support
mixer built-in
o
Fan+Nd magnet
underneath build plate to create a stir mixer
o
Heated bed to
create heating element for the solution bath
o
PLA is used as
soluble support via a NaOH solution in a 60-70C solution for about 3
hours.
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Dual camera monitoring via Octopi
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Webcam monitoring the build
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endoscope to monitor nozzle and layer adhesion
o
Webcam monitoring controlled by servos with tilt and pan
capability.
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Rotating Turntable using Open-Source Ciclops scanner
combined with webcam used for monitoring
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Extendable universal
spool holder with dehumidifer
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Purge and Wipe
brush built-in
Other Technical Specs:
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16-tooth Pulley for Torque
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1/16 Microstepping
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Smoothieboard
o
Shake firmware
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7" Galaxy Tab 4 for local control via SSH to Rpi 2
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800 Watt 24V PSU
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NEMA17 86-oz. in holding Torque
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1.75 Filament
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400mm diameter x 450mm? height
