So why are Prusa’s material profiles so hot?

[3D Printing Tips and Tricks]

I finally got the answer to that. They increased the nozzle temps when they added input shaping to their firmware. They assumed the print speed would be that much faster that the feed rate would need significantly more heat. In practice this was not what I have found and instead the material drools at the start of the toolpath for a tool making a blob that gets crashed into.

[Kurt The 3D Printer GUY!!]

VERY Interesting Andy.

It very much relates to my experiences at Essentium. Since, yeah - we could push the printers to go QUITE Fast - and we typically would go Hotter with the materials - as part of the going faster process. Of course, most of the materials we worked with are more Pro materials - and also designed to run faster and hotter. The low-end of those materials was PCTG - but, they go higher temps and more exotic from there - with HTN, and a lot of Fiber filled materials as well as things like Ultem.

As such, yeah - I can certainly see WHY Prusa might have gone the route with going hotter...

-K

[3D Printing Tips and Tricks]

Of course the faster the feed the more you need the material to be liquid…. But with an XL if you’re going that fast input shaping won’t work all that well. The XL tools are relatively massive. It is NOT going that fast. Yet another thing Prusa did that I for one disagree with. 

[Gary Myles]

Really, we need a automated setting in slicers that knows how much thermal energy is being delivered to the hot end, Ie your PID settings, and nozzle type/material, as these are essentially what is needed to print fast, or slow, depending on the material

The OpenTag for filaments is great to add the specific material properties of the filament. 

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[3D Printing Tips and Tricks]

Perhaps, however as I have found the temps are not only a function of the material, it’s also a function of the use case. A complex multiple tool print needs a cooler temp to avoid drooling as well as a slower speed. An rfid tag won’t be a solution for that.

[Gary Myles]

The RFID tag, can certainly have the viscosity curve that can be parsed into a slicer.

It is just but one of a number of metrics, another is the PID of your hotend, meltzone length etc 

I feel that we need more parameters in slicers to fully understand the dynamics of the whole extrusion system.

So far it is all open loop guesswork 

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[Gary Myles]

Well, I've just added a ticket to the OpenTag 3D github for them to at least provide viscosity parameters to the specification

https://github.com/queengooborg/OpenTag3D/issues/18

Time will tell if it will be incorporated or not