NWA3D Afinibot A31 User manual

Afinibot A31 User Manual
1. Assembly
2. Fine-Tuning
3. Leveling the Build Plate
4. Loading and Unloading Filament
5. Operation: The Four Steps of 3D Printing
6. Troubleshooting
7. Additional Resources
© 2017 NWA3D LLC Version 1.1

NWA3D Afinibot A31 User Manual
1. Assembly
1. Remove the parts from the box and remove any tape and padding from the parts.
Inspect the parts to make sure they were not damaged in shipment.
2. Install the gantry frame (A) to the base frame (B).
a. On the gantry frame, make sure the nozzle assembly is to the front, and the
long vertical lead screw is to the back. On the base frame, make sure the
black belt cover is on the front, and the stepper motor is on the back.
b. Use the M5x20 screws (4) and lock washers (4). Raise the base frame above
the table with two blocks (boxes, books, etc.) Install the screws through the
base frame into the threaded holes in the gantry frame. Tighten with the M5
hex key (Allen) wrench.
A B
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NWA3D Afinibot A31 User Manual
3. Install the two T-shaped frame reinforcement plates. The plate with the limit
switch goes on the left. The plate without the limit switch goes on the right.
a. Loosen the t-nuts by hand and turn them so they will fit inside the grooves on
the frames. You want the nuts to be loose so that when you tighten the bolts,
the nuts will rotate 90° and grab onto the inside of the groove.
b. Align the nuts to the grooves and insert the T-shaped plates into the frames.
c. Tighten all eight bolts using the M4 hex key (Allen) wrench.
4. Attach the white PTFE Bowden tube coming out of the hot end to the yellow tube
coupler on the extruder. Firmly push the tube into the connector on the
extruder. You should feel it slide in and lock into place.
5. Cut and discard the tie wrap holding the nozzle to the gantry frame.
6. Install the filament spool holder.
a. Attach the bracket to the top of the power & control box using two
thumbscrews. Tighten the screws by hand. Do not overtighten.
b. Remove the first nut from the double-nut side of the filament holder tube.
Install the tube into the bracket and re-install the nut to hold it in place.
Tighten the two nuts by hand so that the tube is snugly attached to the
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NWA3D Afinibot A31 User Manual
bracket. Do not overtighten.
c. Tighten the nut on the other end of the tube by hand. Do not overtighten.
7. Connect all electrical cables.
a. Put the power & control box on the left side of the printer with the screen
facing forward.
b. On the right side of the power & control box, make sure the red voltage select
switch reads “110V.” If it doesn’t, select “110V” by gently sliding the switch
with a screwdriver or other tool.
c. Connect the heater cables to the power & control box.
The cable for the build plate heater has four pins. The cable for the nozzle
heater has eight pins. Rotate the connector until the pins slide easily into the
socket. Do not force them. After the pins are fully inserted, hand-tighten the
knurled nuts so they don’t become unplugged.
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NWA3D Afinibot A31 User Manual
d. Connect the stepper motor and limit switch cables.
The Y cables go to the motor and switch at the back of the base frame that
move the build plate. The Z cables go to the motor and switch on the left side
of the base frame that raise and lower the nozzle. The X and E (extruder)
cables go onto the gantry frame. The X cables go to the motor and switch that
runs the belt and the E cable goes to the motor that feeds the filament. Hint:
Install the smaller limit switch connectors first. Small hands are an
advantage. Try not to bend the pin connectors as you push them in.
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e. Connect the power cord to the back of the power & control box and to a
standard 110-volt electrical outlet.
f. Turn the power on using the switch on the back of the power &control box.
g. To operate the controls, rotate the button to scroll and push the button to
select.
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2. Fine-Tuning
1. Adjust the tension of the build plate assembly on the Y-axis on the base frame.
a. Check the tension of the build plate assembly. Hold the build plate carriage
under the build plate and try to wiggle it left and right. If the build plate
assembly wiggles back and forth on the Y-axis track, it is too loose.
b. To tighten the build plate assembly, rotate the three eccentric nuts that
connect the three wheels to the right side of the build plate assembly. Use the
open-end wrench to rotate the nuts slightly—a quarter turn is usually
enough—until each of the three wheels is snug against the Y-axis frame and
the carriage no longer wobbles.
c. Re-check the tension of the build plate assembly. The assembly and the belt
should move forward and backward without much effort, but there should
have no side-to-side wiggle or play.
2. Adjust the tension of the gantry on the right pillar of the gantry frame.
a. Check the tension of the gantry assembly at the right pillar of the frame. Hold
the gantry and try to wiggle it up and down. If the gantry wobbles on the
right pillar frame, it is too loose.
b. To tighten the carrgantryiage, rotate the one eccentric nut that connects the
wheel to the inside of the gantry. Use the open-end wrench to rotate the nut
slightly—a quarter turn is usually enough—until the wheel is snug against
the frame pillar and the gantry no longer wobbles.
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NWA3D Afinibot A31 User Manual
3. Adjust the tension of the nozzle assembly on the X-axis on the gantry frame.
a. Check the tension of the nozzle assembly. Hold the mounting bracket behind
the nozzle and try to wiggle it back and forth. If the nozzle assembly wobbles
on the X-axis track, it is too loose.
b. To tighten the nozzle assembly, rotate the one eccentric nut that connects the
wheel to the bottom of the nozzle assembly. Use the open-end wrench to
rotate the nut slightly—a quarter turn is usually enough—until the wheel is
snug against the X-axis frame and the assembly no longer wobbles.
c. Re-check the tension of the nozzle assembly. The assembly and the belt
should move left and right without much effort, but there should have no
side-to-side wiggle or play.
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NWA3D Afinibot A31 User Manual
4. Check the tension of the belt driving the Y-axis (under the build plate). The belt
should be taut, with no slack or slop.
a. If the belt is loose:
Loosen the four bolts at the front of the base frame holding the belt follower
pulley to the base frame.
Using an Allen wrench as a lever, push the follower pulley to tighten the belt.
Holding the belt taut, tighten the four bolts.
5. Check the tension of the belt driving the X-axis (on the gantry). The belt should
be taut, with no slack or slop.
a. If the belt is loose:
Loosen the two bolts at the right side of the gantry holding the belt follower
pulley to the gantry.
Using an Allen wrench as a lever, push the follower pulley to tighten the belt.
Holding the belt taut, tighten the two bolts.
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3. Leveling the Build Plate
To build good parts, the build plate needs to be level, and the nozzle needs to be
about 0.1–0.2mm from the build plate in all locations. If you have a LokBuild print
surface, we recommend a distance of 0.20–0.25mm. This is about the thickness of
two pieces of paper (or one piece folded in half to double its thickness). If you use
painter’s tape as your print surface, we recommend a distance of 0.1mm. This is
about the thickness of a single piece of paper. You want to adjust the height of the
build plate so that you can barely slide the paper between the nozzle and the build
plate with only a little resistance.
1. Select Control > Temperature > Bed. Turn the bed temperature to 55°. Then
navigate back to the Info Screen. This will heat the bed to actual printing
conditions, making the leveling more accurate.
2. Select Prepare > Preheat PLA. This will heat the nozzle and melt any hardened
plastic that might be on the nozzle and affect the leveling process.
3. Select Prepare > Auto home. This will move the nozzle to the home position at
the front left corner of the build plate.
4. Select Prepare > Disable steppers. This will allow you to move the nozzle
assembly (X axis) and build plate (Y axis) by hand.
5. Pro Tip: The Z axis stepper is also disabled, and you don’t want it to move at all.
So you should handle the printer gently during the leveling process. Keep it flat
and move the nozzle assembly carefully.
6. Wait for the print bed temperature to reach 55° and the nozzle temperature to
reach 195°C. The Info screen displays this information below the nozzle and bed
icons.
7. Slide a piece of paper between the nozzle and the build plate.
8. Adjust each of the four thumbscrews under the bed until the piece of paper
slides, with just a tiny bit of drag, in all locations on the build plate.
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NWA3D Afinibot A31 User Manual
9. Select Prepare > Auto home, then Prepare > Disable steppers, and recheck in
several places. This is to make sure the Z-axis lead screw didn’t rotate during the
leveling process.
10. You may need to make fine adjustments to the bed level when you start printing.
The first layer of the print will show whether the distance between the nozzle
and build plate is correct. Refer to the following graphic.
a. If the bed is too low, the extruded plastic may not stick to the build plate.
Parallel lines of filament on the first layer will look rough, with high tracks
and low valleys that are not stuck to the build plate.
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NWA3D Afinibot A31 User Manual
b. If the bed is too high, the extruded plastic will squeeze out the sides of the
nozzle. The nozzle will plow through the plastic and leave a first layer that is
too thin.
c. You can try to carefully adjust the thumbscrews during the first layer of the
build while the plate is moving until the distance between the build plate and
the nozzle is producing smooth extruded lines. Be careful of the moving parts
to not get pinched.
d. After you have fine-tuned the bed level during the first layer, you may want
to stop the build, clear the build plate, and restart the build.
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4. Loading and Removing Filament
1. Loading filament
a. Load a spool of filament into the spool holder.
b. Cut off the used or bent end of the filament at an angle and it will be easier to
feed into the extruder and Bowden tube.
c. Feed the end of the filament into the extruder with one hand as you squeeze
the extruder release lever with your other hand.
d. Push the filament all the way through the Bowden tube until it stops when it
hits the back of the nozzle.
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e. Select Prepare > Preheat PLA.
f. When the printer is fully heated, check to make sure the filament is fully
loaded. This also removes all of the previous material left in the printer from
other prints. To do this, manually push filament through the heated nozzle
until the new color begins coming out of the nozzle.
g. Pro Tip: Never leave the printer preheated with material inside of it for long
periods of time. This will cause the filament to bake inside of the nozzle
assembly and can cause it to clog.
2. Removing filament
To remove the filament cleanly, you should do a “soft pull.” This involves heating
the nozzle to 100°C, then pulling the filament out of the printer.
a. Select Prepare > Preheat PLA and wait until the nozzle temperature reaches
100°C. (You can also select Control > Temperature > Nozzle, spin the
temperature to 100°C, and then navigate back to the Info Screen.)
b. Wait for the nozzle to reach the set temperature.
c. When the nozzle temperature is 100°C, squeeze the extruder release lever
with one hand and pull the filament out of the extruder with your other hand
in one fluid motion.
d. Cut the end of the filament to remove the partly melted plastic.
e. Pro Tip: Feed the end of the filament into the hole on the side of the spool.
This will insure it doesn’t get tangled and cause a build to fail the next time
you use it.
f. Remove the filament spool from the spool holder.
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5. Operation: The Four Steps of 3D Printing
3D printing involves four steps:
1. Create or find a 3D file
2. Slice the file for 3D printing
3. Send the file to the printer
4. Print!
1. Create or find a 3D file
a. You can create a 3D model—a digital geometry—using any CAD
(computer-aided design) software program. We recommend free programs,
such as TinkerCAD, OnShape, and Blender. Another is SketchUp, which has
free licenses available for schools. These programs take some time to learn,
and can be challenging. But they are also rewarding, especially when you see
your own creation being printed on your 3D printer!
Every CAD program allows users to save or export digital files for 3D
printing. You want to save your file as an STL file (“filename.stl”). The STL file
is the standard file format for 3D printing. In some programs, it’s as easy as
the Save command. In others, you need to select the File > Export option, and
choose the STL format. OBJ files can also be sliced and 3D printed.
b. You can find 3D models in many online libraries of digital content.
Thingiverse.com, GrabCAD.com, and Instructables.com are examples, and
many other sites exist.
2. Slice the file for 3D printing
Slicing is the process of converting your 3D model into the layered print
language your printer can understand, called G-Code. We recommend using free,
open-source slicer programs. Our favorite slicers are Cura and Repetier Host.
Both are free and easy to use. We’ve included Cura and its setup .ini file on your
printer’s SD card because it’s easier for beginners. We recommend that you
install Cura on a PC or Mac and use it to do your slicing.
There are a lot of slicers that will create G-Code automatically for your printer.
All you have to do is input the correct settings for your printer (using the files we
included), import your 3D model, and click slice! It’s that easy.
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a. Install the Cura program on a PC or Mac.
b. Open the Cura application. You’ll be given several options. In the
Configuration Wizard, choose the RepRap Machine and Mendel in other
machine settings (RepRap (Marlin/Sprinter) G-Code Flavor, if it asks).
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NWA3D Afinibot A31 User Manual
c. Once you add the new machine, click Machine > Machine settings and change
the machine settings to: Max width 300, Max depth 300, Max height 400,
Extruder count 1, and check Heated bed. You can also rename the machine to
“A31” or “Our Giant 3D Printer” if you’d like. Click “OK.”
d. Select File > Open Profile and select “NWA3D A31 Printer Profile.ini” from
the microSD card. This is the medium-quality settings for the A31 printer.
e. The “A31 Printer Profile.ini” settings in Cura for the A31 are shown on a
screen capture on the microSD card. They are also shown in the following
image.
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f. Use these default settings for printing. You may need to change the support
type to “Everywhere” depending on the shape of the part you are printing.
Also, you can change the layer height from 0.2mm to 0.1mm for a smoother
part, although the print will take longer. As you become more advanced with
3D printing, you may want to experiment with many settings. But remember
that you can always revert to these default settings at any time, or ask us for
help at nwa3d.com/support.
g. Load the model file in Cura. Rotate the file to the best orientation for printing.
You may want to scale the file at this point as well.
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h. When you are satisfied with the Cura settings and the position, orientation,
and scale of the model, select the “Save toolpath” (or “SD” if the microSD card
is inserted) icon or File > Save GCode. Save the file to the microSD card that
came with your printer.
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