New way to reduce print times  

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shanosburgess
(@shanosburgess)
New Member

I have an idea that seems simple in my head (not from a coding standpoint, that's way beyond me!) I have mulled it over many times and spoken with a few very close printing friends and they all agree that if it could be implemented it would save huge amounts of print time. 

I am not sure about posting it up on here as it could be a game changer and would hope that it might get some recognition, or atleast cool bragging rights with my kids lol.

Do any of the Devs frequent the forum? Would love to run it by one and see where it goes.

Fingers crossed they will agree it's cool and one day soon it could become a feature.

Hope to hear from a dev or interested party soon.

Shane

Posted : 14/08/2020 4:31 pm
3Delight
(@3delight)
Moderator Moderator

No, Prusa staff rarely visit these forums.  Why not email to Prusa directly?

Posted : 14/08/2020 4:36 pm
bobstro
(@bobstro)
Illustrious Member

You can post feature requests up on the Prusa github pages where the devs might see it. More often than not, these sorts of things turn out to already be implemented, or have been tried and rejected. Rather than being all secretive about it, why not simply describe it here for discussion? If you're hoping to cash in, you really should consult a patent lawyer. The community in general, and Prusa in particular have no qualms about giving credit where due. They regularly call out contributes on their code pages.

This post was modified 2 months ago 2 times by bobstro
My notes and disclaimers on 3D printing and miscellaneous other tech projects
He is intelligent, but not experienced. His pattern indicates two dimensional thinking. -- Spock in Star Trek: The Wrath of Khan...
Posted : 14/08/2020 4:41 pm
shanosburgess
(@shanosburgess)
New Member

Fair enough I guess I can always refer back to the post in the future.

The idea is to use say a .2 nozzle (should scale up as well to .4 etc) and rather than print the entire layer at the same height, have the outer walls print twice at .1 building a smooth shell that is .2 in height

Then have the infil go in and fill at .2 (or if using a .4 have infil at full height).

I cannot see how it would cause issues for the print head as the way I see it the infill would be no different than if the outer skin was printed at .2 in the first place.

It would be interesting to see how it affected the print time of a larger object using a .8 nozzle with outer walls printed at .2

I know the slicer has variable layer heights already but that still prints the entire layers at the choose height.

Let me know what you think? 

Shane

Posted : 14/08/2020 4:52 pm
bobstro
(@bobstro)
Illustrious Member

This has been done. You're still constrained by the nozzle size, so it only works if your double-height layers are still blow roughy 80% of your nozzle size, which in turn limits your normal layer heights. It's in PrusaSlicer now. 

My notes and disclaimers on 3D printing and miscellaneous other tech projects
He is intelligent, but not experienced. His pattern indicates two dimensional thinking. -- Spock in Star Trek: The Wrath of Khan...
Posted : 14/08/2020 5:07 pm
bobstro
(@bobstro)
Illustrious Member

I was on mobile. Here's a more complete answer:

Enabling Print Settings->Infill->Reducing print time->Combine infill every X layers has the effect you described. Here's the setting:

The limitation is that your combined infill layer heights are still limited to 80% of the nozzle size or less to ensure good adhesion. Any higher and extrusions will have a round cross-section that doesn't provide as much surface area to adhere to adjacent layers. This in turn limits your external perimeter heights to a fraction of that. With a 0.4mm nozzle, your infill could be printed at 0.32mm but your outer perimeters are limited to 0.16mm (assuming you want nice even multiples). If you want to use combine more than 2 infill layers, the perimeter heights drop proportionally. This has the effect of increasing overall print times as you're reducing layer heights, then offsetting that somewhat with this strategy.

Here's what it looks like in action:

It's not a bad idea, and I don't meant to be discouraging. The time gains aren't particularly worthwhile in my experience. A 40mm cube that normally prints in ~1h33m drops to ~1h27m in the slicer estimate. These are usually close.

Oddly enough, this is the 3rd time I've seen someone with a "super fantastic idea" turn out to be exactly this same feature once they explain it. Don't feel hesitant about suggesting and discussing these sorts of topics. There's a wide user base with a lot of deep experience here that is happy to kick around ideas. When you get a good one, posting it up on the GitHub pages is your best bet.

This post was modified 2 months ago by bobstro
My notes and disclaimers on 3D printing and miscellaneous other tech projects
He is intelligent, but not experienced. His pattern indicates two dimensional thinking. -- Spock in Star Trek: The Wrath of Khan...
Posted : 14/08/2020 5:43 pm
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