CTC Bizer with 0.8mm Nozzle: Difference between revisions

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[[File:Bizer08Nozzle00007.jpeg|thumb|none|666px|alt=|• reduced layer height to 0.3mm, resulting in VR of 14.4mm³/s :-D]]
[[File:Bizer08Nozzle00007.jpeg|thumb|none|666px|alt=|• reduced layer height to 0.3mm, resulting in VR of 14.4mm³/s :-D]]


#TLDR: ''Reduce volumetric rate (extruder throughput) until it looks fine :)''
<code><nowiki>#</nowiki>TLDR</code>, ''Reduce volumetric rate (extruder throughput) until it looks fine :)''


= Lessons Learned =
= Lessons Learned =

Revision as of 13:14, 23 July 2021

About

A larger nozzle will result in much faster prints, right? Since it affects the printing volume it will affect it like this: 

(new diameter / old diameter)^3
(0.8/0.4)^3 = 8

Hoorray! 8 times faster! At least I thought that…

The Problem

The prints were awful:

  • Outer Perimeters looked good, but walls were not completely filled
  • Infill looked uneven and hat "holes" in it
  • Looked like underextrusion, so I cranked up the extrusion multiplier (with no effect)
  • Triple-checked that extruder is working and the wires are not (again…) broken
  • After some googling I found Bob's Project Notebook (Mupped Labs) - which lead me into the right direction…#The Solution
  • …read on! The pictures will nicely illustrate what I've changed and what effect it had:
• gaps in walls
• infill…barely "infill"…
(• first layer height too low)
• looked like underextrusion, so extrusion multiplier increased → no effect!
• still looked like underextrusion, so extrusion multiplier increased even more (the more, the better, right?) → still no effect! That was weird! Is the extruder-troughput somehow limited?
• this was the moment, I remembered that there was a limitation, the volumetric rate, which I had read some weaks ago onBob's Project Notebook
• I then calculated the volumetric rate (VR), and it was 28.8mm³/s…a bit high as it turned out…
(• and yes, I reduced speed from fast to medium in Simplify3D, but that actually didn't change anything. This preset only changes layer height, not the actual speed. And since I manually set layer height, it hat no effect)
• no changes, just a bigger object…

The Solution

• reduced layer height from 0.6 to 0.4mm, resulting in VR of 20.64mm³/s
• \o/ this looked much better!
• reduced layer height to 0.3mm, resulting in VR of 14.4mm³/s :-D

#TLDR, Reduce volumetric rate (extruder throughput) until it looks fine :)

Lessons Learned

As the author should already have known from RFC1925(8,9) is:

(8) It is more complicated than you think.
(9) For all resources, whatever it is, you need more.


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