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I got some spare tennis strings. These are made out of co-polyester: Tennissaite HEXASPIN jetzt bestellen bei Pro‘s Pro! I want to use it because it is way stronger than normal filament and also very abundant in my house. Would love to hear back. Thanks Dontmindme

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You would need to know:

Melting point, diameter, and your printer would have to be able to take such sizes.

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I would not recommend it. You dont know how safe the fumes are, you dont know how your printer will react, and I suspect if you get a clog you will be never get it unclogged.

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Filament is usually created at a given width within some fairly tight tolerances for even the cheap and cheerful unbranded stuff. I would doubt that you’d be able to feed this successfully (it’s hexagonal!!!) without jamming or underextrusion issues for starters.

Although it does say it’s co-polyester, there could also be a multitude of other elements in the mix that might object to you heating them so you really would need to make sure that you have lots of ventilation - just in case.

At the end of the day, if you want to try it, it’s your machine and you accept the conseqences of that but dont expect it to be either straightforward or easy. Depending on what you mean by ‘normal’ filament, to be honest, for the price in the link, i’d be looking at ‘real’ filament as at least you know where you’re starting from…

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Thanks. The only reason i want to do it is not the price but the pure strength. A normal tennis string can hold up to 30 kg at 1.28mm thickness. A 3D print with this strength will allow for even more applications and use beyond prototyping. But from what you saw in the link do you think this is even printable (disregarding temperature, thickness or speed)?

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I dont know the technical details but are there coatings in the nozzles that help prevent the filament sticking? Thanks