> If this is a problem, you should buy a new printer that actually keeps the filament conduits away from the hotend
The filament is still in contact with the PTFE tube, the PTFE tube is also hand-cut by me and in motion with the head so it undergoes wear. Even when you get an all-metal hotend there are ways of contamination by PTFE passing through the hot-end and degrading into harmful chemicals.
> purging old filament anyways before starting a new one. My slicer does this by default.
I do purge and cold-pull. While this removes the bulk of the old filament it does not remove all trace amounts of it.
> These days, heated beds are covered in PEI. That's food-safe too.
It is food-safe only if it was produced in a food-safe manner and was kept food safe afterwards, including no contact with pollutants.
Since you mention evidence, I have no way of proving that anything I produce is food-safe. Literally not anything in my extrusion path is certified food-safe, let alone I have equipment to test.
The fact of the matter is that glass, ceramic, and stainless steel has replaced any vessels that are in contact with food at home, and I don't intend to look back on that, and I am in fact looking to replace anything in regular contact with human skin with non-synthetic/non-plastic alternatives -- this includes clothes, bed sheets and others.
While there is the hacking mindset, people also need to be responsible, and my red lines on that is making stuff with a safety aspect to it. Food safety is safety as much as fire and electrical safety in my book.
The filament is still in contact with the PTFE tube, the PTFE tube is also hand-cut by me and in motion with the head so it undergoes wear. Even when you get an all-metal hotend there are ways of contamination by PTFE passing through the hot-end and degrading into harmful chemicals.
> purging old filament anyways before starting a new one. My slicer does this by default.
I do purge and cold-pull. While this removes the bulk of the old filament it does not remove all trace amounts of it.
> These days, heated beds are covered in PEI. That's food-safe too.
It is food-safe only if it was produced in a food-safe manner and was kept food safe afterwards, including no contact with pollutants.
Since you mention evidence, I have no way of proving that anything I produce is food-safe. Literally not anything in my extrusion path is certified food-safe, let alone I have equipment to test.
The fact of the matter is that glass, ceramic, and stainless steel has replaced any vessels that are in contact with food at home, and I don't intend to look back on that, and I am in fact looking to replace anything in regular contact with human skin with non-synthetic/non-plastic alternatives -- this includes clothes, bed sheets and others.
While there is the hacking mindset, people also need to be responsible, and my red lines on that is making stuff with a safety aspect to it. Food safety is safety as much as fire and electrical safety in my book.