Non-quickfit bands?

Yes you can. And on the F6 you don't need any screwdriver to remove the pins because they are fastened through a spring mechanism. 

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As the pins are spring loaded you can use any normal strap if you would choose so. Pins can easily be removed with a simple tool https://youtu.be/ubU9bujiv-I?t=85 (or by thin pliers etc). Just keep an eye on the actual thickness of the strap, as a really thick leather strap might not fit the gap between pin and watch case.....

Good to know. Do you know more details on compatibility?

* Is it compatible with the (de facto) standard watch straps we can see on many dumbwatches? This would be a great improvement over Fenix 5 series.

* Is it also compatible with the QuickRelease (not QuickFit) mechanism we can see on some other watches (e.g. Vivoactive 3)? There seem to be lot more QuickRelease bands than QuickFit.

* Is it true also for fenix 6S? I suppose so.

Of course, even if the mechanism matches, there are two more things to match:

* Strap width

* Space: If you have a thick strap, there might be too low space, especially on 6S

v6ak said:

Is it compatible with the (de facto) standard watch straps we can see on many dumbwatches?

Since the Fenix 6 line uses spring bars (albeit fat ones), any traditional watch band that is the correct width should work, whether they use thin spring bars or fat ones.

Is it also compatible with the QuickRelease (not QuickFit) mechanism we can see on some other watches (e.g. Vivoactive 3)?

Yes, bearing in mind that quick release spring bars have thin tips like most non-quick release ones, so there will be some play because the tips of the spring bars are narrower than the holes in the case of the watch. Fat spring bars like the ones used on the Fenix have thicker tips.

Is it true also for fenix 6S? I suppose so.

Yes.

Strap width

The 6s takes 20mm, the 6 takes 22mm, and the 6X takes 26mm.

Thank you. So, the QuickRelease springs are likely to be best with some additional filling.

Maybe I can try to make a 3D model, but this can easily fail on real-world printers due to the minimum walls…

Nice watch face, what is it called? Thank you!

AndreiDracul said:

Nice watch face, what is it called?

That's SC8 by Stanislav Bures, found here: SC8 - Garmin Connect IQ