Tube Cube: Portable CoreXY printer with NEMA14, Bluetooth, etc

thingiverse

<b>UPDATE 2/23/2019</b> I added a couple of STL files, if someone wants to build this with 8mm linear rods. THESE FILES ARE UNTESTED. On another note, I would recommend using T16 pulleys all the way around. I ordered some because they will give you 20% more torque and even finer resolution. ----------------------------- <b>UPDATE 2/18/2019</b> I really like this new printer. The prints are amazing for a rat parts printer. Don't get me wrong, I still love my two HEVO's, but his thing can print probably most of the parts that I print on a regular basis (but I used my 300x300 HEVO to print the bed carriage for the Tube Cube). Long story short, if I build another one, I would make it easily reproducible with standard parts, such as 8mm linear rails, NEMA14 for Z-axis, a standard control board, standard power supply, etc. I think this thing can be built fairly cheap even if built with standard parts. If you have some time to burn, I would love to see a more reproducible remix! ----------------- This is a true build of leftover parts! *NO* linear rails, *NO* NEMA 17 steppers, *NO* bearings, *NO* Ramps 1.4, *NO* Mega 2560, *NO*, *NO*, *NO*, *NO*, *NO*..... https://youtu.be/Fd4omaQ4yoY <b>Print Volume:</b> 130mm x 170mm * 100mm <b>Size:</b> 295mm x 295mm x 260mm <b>VERY IMPORTANT:</b> The NEMA 14 steppers that I used are VERY sensitive to over voltage and I turned mine into hotend accidentally. So make sure you turn your stepper driver down. I ended up setting the voltage for my 0.4A stepper around 0.16V. <b>Notes:</b> - The NEMA14 steppers are not as powerful as NEMA17 steppers. Therefore you need to run the print slower and make sure that all the axis are running smooth or you could end up with missed steps. Other option is buy stronger NEMA14 steppers. I paid $15 for two steppers, so it was on the cheaper side. - The RPI Zero is fine with this configuration especially if you are not running a webcam. - Since it is my plan to have this portable and not always connected to a Wifi network, you should enable Bluetooth PAN (Personal Area Network). I have two Cura configurations, one for WiFi and one for Bluetooth. - You don't need to use screws to keep it all together, as you can see I used superglue, just make sure it's all aligned and smooth prior to gluing. - The CNC shield v4 really is poorly designed, so I never used it in a project. Pins are incorrect (Dir/Stepper reversed), the Micro-stepping does not work until you pull the jumpers off and solder a new jumper to 5V+. The thermistors need a capacitor and resistor to get it working, and then you need to add another stepper and 2 or 3 Mosfets (hotend, print fan, poss heated bed). Anyway, you get my drift. If you want to keep it simple, or don't already have one of these around....get a Mega and RAMPS. <b>BOM:</b> - 12 x 260mm x 16mm Aluminium tube - 4 x 255mm x 12.75mm Aluminum tube for linear rails - Lots of PLA - Arduino Nano & CNC shield v4 - PCB board and some electronic components for an expansion board (extruder driver and hotend and print fan mosfet) - NEMA 14 stepper - stepper from HP laser jet printer - some wire - J-style hotend (24V) - 3mm Aluminum plate for print bed (not heated) - Dell 100W laptop power supply (19.5V, 4.8A) - 1 x NEMA 17 Stepper for extruder (didn't really want to use it, but didn't have another NEMA 14 on hand) - 2 x 295mm carbon fiber arrows for x axis - short piece of ball screw (left over from HEVO build) and anti-backlash nut <b>Printing Notes:</b> - X Carriage: All printing supports are part of the design. After printing you just cut them out (gently). Note: you need to flip it, since the supports are pointing up the way it is uploaded. - Y Carriages: Printed standing up, no supports. <b>Firmware:</b> I started with Teacup, but had issues and decided to move on. Now I'm using a RPI Zero W with Octopi and Klipper. Not the best combo, but not bad for a $10 RPI and a $6 Nano with shield. Note, the RPI is overclocked and has two stepper driver heat sinks attached. All non essential Octopi plugins (even default ones) have been deactivated. <b>Adding Bluetooth PAN</b> Run: sudo apt-get install bluez-tools Create the following files: /etc/systemd/network/pan0.netdev [NetDev] Name=pan0 Kind=bridge /etc/systemd/network/pan0.network [Match] Name=pan0 [Network] Address=172.20.1.1/24 DHCPServer=yes /etc/systemd/system/bt-agent.service [Unit] Description=Bluetooth Auth Agent [Service] ExecStart=/usr/bin/bt-agent -c NoInputNoOutput Type=simple [Install] WantedBy=multi-user.target /etc/systemd/system/bt-network.service [Unit] Description=Bluetooth NEP PAN After=pan0.network [Service] ExecStart=/usr/bin/bt-network -s nap pan0 Type=simple [Install] WantedBy=multi-user.target Then run sudo systemctl enable systemd-networkd sudo systemctl enable bt-agent sudo systemctl enable bt-network sudo systemctl start systemd-networkd sudo systemctl start bt-agent sudo systemctl start bt-network Finally to pair, run: sudo bt-adapter --set Discoverable 1 <b>Klipper Printer Config</b> DO NOT COPY THIS FILE WITHOUT CAREFULLY READING AND UPDATING IT FIRST. Incorrectly configured parameters may cause damage. [stepper_x] step_pin: ar5 dir_pin: ar2 enable_pin: !ar8 step_distance: .00625 endstop_pin: ^ar9 position_endstop: 0 position_max: 130 homing_retract_dist: 5.0 [stepper_y] step_pin: ar6 dir_pin: ar3 enable_pin: !ar8 step_distance: .00625 endstop_pin: ^ar10 position_endstop: 0 position_max: 170 homing_retract_dist: 5.0 [stepper_z] step_pin: ar7 dir_pin: !ar4 enable_pin: !ar8 step_distance: .001736 endstop_pin: ^ar11 position_endstop: 100.2 position_max: 100.2 homing_retract_dist: 5.0 [extruder] step_pin: ar13 dir_pin: ar12 enable_pin: !ar8 step_distance: .010526 nozzle_diameter: 0.400 filament_diameter: 1.750 heater_pin: analog2 sensor_type: NTC 100K beta 3950 sensor_pin: analog6 control: pid pid_Kp: 26.322 pid_Ki: 1.300 pid_Kd: 133.253 min_temp: 0 max_temp: 250 [fan] pin: analog1 [mcu] serial: /dev/ttyUSB0 pin_map: arduino [printer] kinematics: corexy max_velocity: 150 max_accel: 200 max_accel_to_decel: 50 max_z_velocity: 25 max_z_accel: 30