What will be the strongest part?

[Temo]

Hello

What will be the strongest part

- the red with the tapered top, that will get a bit more closed surface area

- or the grey square with a sort of higher stiffener wall at the other ends?

There will be attached a X-belt to the idler you can see in the red one, and it will be printed laying down flat, so the layers will be mostly parallel with the force, not so good I guess.

Terje

[Aggresive]

To be honest, they're both probably as strong as each other, at least where it matters. (see pic), although the gray part is probably a bit stronger, as it has more plastic supporting the bolt, but either way, in order to fail, the part would have to split at a layer.

The forces the belt will be putting on the idler are going to try and pull that bolt sideways out of the part, so the most important part is that the walls that are keeping the bolt in position are strong enough.

So long as you print with enough perimeters, probably a minimum of 3, and high infill 30-50%, it will be more than strong enough. and if you print in PLA instead of ABS, the layer bonds shouldn't be a problem. (so long as you print hot enough that the layers melt to one another).