D3D v18.07 Data Collection

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Axis Motion

  • Do not overtightnen the idler bolt - as that pinches down on the idler and makes motion difficult. This is an issue with 8 mm rods, but it was not an issue with 5/16" rods - as outer part of idler piece bottoms out on clamping, not allowing the center to pinch in. When larger rods are used, the center can pinch in more.
  • On minimum setting with cordless drill - back away by hand using an allen wrench - 1/2 turn back away


Benchmarking

Comparison between Jellybox and D3D

See print quality; currently using 5/16 rods in D3D. Need to switch to 8 mm to get better print quality. Grey is D3D.

Jellybox

D3D here is benchmarked against Jellybox because Jellybox is the leading printer for education workshops, and its print speed is impressive due to the light platform weight. D3D should be able to exceed print speed for large objects, but not for small object (Jellybox may be better at inertial effects for small objects due to its low platform weight whenever objects are not tall and wobbly). Data:

  1. 12 of the OSE Motor Pieces for D3D are printed reliably at 300% speed, starting with 100% speed for first layer. Total print time - 10 hours 38 min.

Prusa i3 MK3

Here we benchmark against the Prusa i3 MK3, the most populous printer in the world.

  1. See review post - https://www.prusaprinters.org/original-prusa-i3-mk3-2-months/
  2. See clone - https://unixb0y.github.io/blog/
  3. While Prusa i3 MK3 claims to be open source, I cannot find any hardware files on Github or elsewhere, outside of the 3D printed parts.

Extruder Heat Sink Fan

  • The extruder heat sink fan should be blowing INTO the heat sink fan.
  • When wired properly, the blue label should be facing inside. This may vary for different fans - so check the fan blowing direction with red wire to positive.

Hot End

Note teflon tube:

Running

5/16" rods should be replaced with 8 mm rods. Banding occurs - see comments in post.


Homing

  • X and Y home well
  • Z moves down and stops. Huh? Never seen this before. Z stop triggered without z probe connected?
  • > M119

< Reporting endstop status < x_min: open < y_max: open < z_min: TRIGGERED

  • Issue - Z probe - I have LJ18A3-8-Z/BY-5V. Is BX recommended? What is the difference? BY vs BX appears to be Inverting vs non-inverting.
  • Trying #define Z_MIN_ENDSTOP_INVERTING true - changing it to false. It worked.
  • I left Z_MIN_PROBE_ENDSTOP_INVERTING at falso - so I changed only 1 thing.

Temperature Reporting

  • 2 initial prints had a temperature error in the first half of a print, running at 200%. Don't know why - suspecting inductance effects on cabling.
  • I noticed the LCD is 60/60 and 218/218 for temperatures - whereas the Cura output goes down to 217 and 59 about half the time.

Extruder Failure Modes