Very good article @Florian_Horsch_flouS - it was great to finally meet you and @Kai_Parthy in Berlin. I’m also of the view that we will need quite different hot-ends for different materials. Having a more complicated (multi-heat-zoned) ‘programmable’ hot-end will not totally fix the issues for many-material, print speeds v quality and a whole host of other considerations, many we still don’t really understand. FDM is still such a crude and basic way to make finished parts, although it does produce strong and accurate prints when setup well. I’m not convinced that adding multi-staged heating complexity into a technology this basic really adds much to the output or even makes it easier for ‘everyone’ to 3Dprint. I would always encourage people to be very aware what materials they are putting into their printer, and exactly what temperatures they are being melted at. - Switching to a good quality thermocouple makes for a significant step forward for most users, at least temperatures being quoted should be closer to reality. Even if that makes it easier to support people and improve print quality, that’s what most people need.
It would be nice to see how this system can detect material type, I’m not convinced yet, due to the massive range of properties ABS and PET show by different manufacturers. Even PLA can act very differently depending on the batch, colour additive and impact modifiers.
By far the easiest way to get good settings is to have the material data read from the material spool into the printer, that way the hot-end does not need to try and work it out.
I’m all for a little more intelligence in extruders and hot-ends, but going to this level of complexity does not seem worth the hassle, benefit or print reward, it may be a step too far for FDM.
Another really tricky aspect is when you start going faster, and that’s a significant factor for most people, printing fast with good quality – then ‘melt’ temperatures are so transitional that the energy transfer seen by the material is the bigger issue. Start to increase the melt-zone or move to a multi-zone warming-heating-melting system can get you more speed, but other issues start to crop up. With retraction, oozing and physical speed of travel moves still being way too slow for the process of spitting out molten plastic from a tiny nozzle. Sensing pressure here will help, if you can get a closed-loop control heater system going fast enough…
I don’t want to be or sound negative. I’m sure we will crack many of these problems to keep things open and advancing for the greater good. More open discussion on them is a fantastic thing.
What does everyone else think? Please challenge my views too, they are only one opinion.
That was a lot longer than expected !