3D Printer - Metric Cerberus Delta Bot

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Metric Cerberus Delta Bot
Cerberus.JPG
Location Location:So Make It
Owner So Make It


Contents

Overview

This printer was the result of this project. It is a "Delta" style 3D Printer, other oddities are that it uses spectra line to drive the A, B and C carriages, it has a bowden extruder, and it uses Force Sensing Resistors to level the bed in firmware by probing. Cerberus is easy to use, quite tall and by far the fastest printer in the space, however it is limited to printing in PLA only.

How to Use

  1. Generate a toolpath using one of these configurations in Slic3r
    • Fast PLA - Fast printing, coarse quality.
    • Fine PLA - Fine quality, longer print time.
    • Spiral PLA - Single continuous perimeter with no infill.

    (right click -> Save link as...) Once Slic3r is installed load the configuration file with File -> Load config, then add your model in STL format, change any setting you might like to, then click export gcode.

  2. Turn on the ATX Power Supply connected to the printer, Cerberus may hiss at you, this is normal.
  3. Put your *.gcode toolpath file on an SD card and load it into the left side of the LCD display, there is an SD card provided.
  4. The three FSRs under the glass disk are connected to the bed temperature sensor, there is no heated bed. Make sure that the "temperature" goes up by about 20C when you press firmly on the bed. If it does not, adjust the FSRs position until things are working better.
  5. Clear any extrudate from the brass nozzle.
  6. The menu system is operated by pressing and rotating the wheel, print by Click -> Print from SD -> Your_File.gcode.

Now sit back and enjoy your print. There is no need to pre-heat, Cerberus starts up very fast. Turn the power supply off when you are done.

If you need to stop Cerberus

  1. Click -> Stop Print.
  2. Click -> Prepare -> Cooldown.
  3. Click -> Prepare -> Auto Home.

If you are unsure, just turn the Power Supply off and look for Mark or Bracken.

Maintenance

The printer uses a fork of marlin by Beanz for the FSRs, currently it is kept, with the config that was used, in this repository: https://github.com/so-make-it/Marlin4Cerberus
The Slic3r configurations above are in this repository: https://github.com/so-make-it/Config4Cerberus

There is a monthly maintenance check-list printed in the space, source is here: https://github.com/somakeit/operations/blob/master/Printer%20Service%20Schedules/Metric%20Cerberus%20Service%20Schedule.ods

Machine specifications

Printing

Print Surface: Toughened Glass with 3M Scotch Blue Painters Masking Tape

Print Area: Cylindrical, 125mm radius, 550mm height at centre, less to the side.

Print Volume: Big.

Top Print Speed: 130mm/sec ish.

Print Tolerance: Tolerant.

Layer Thickness: Say 20 to 350 microns.

Supported Materials: PLA

Usable Filament Sizes: standard 1.75mm

Physical Dimensions

Overall Dimensions: Less than a desk.

Weight: 5KG ish


Electrical

Power Requirements: 12V DC, 50W (30W normal running).

Temperature: Maximum operating temperature (Extruder), 240C

Temperature: Maximum operating temperature (Heated Bed), room temperature

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