Z-axis too low?  

It's difficult to say without seeing the underside of the model or a Z calibration print.

Bear in mind that the models supplied with the printer have specific purposes, most of them are intended to be easy to print for a first time user or to test the function of the printer.  The frog has a large area in contact with the build surface and is not tall enough for poor adhesion to become a significant issue ... and it's cute.

That said, your build sheet is dirty and unless you keep it clean adhesion *will* become a problem when you try some more challenging prints.

Welcome to the forums.

Cheerio,

RE: Z-axis too low?

RE: Z-axis too low?

thanks for your response by the way!

RE: Z-axis too low?

It does look a bit too low going by the wave pattern in the first layer.  However your initial point about 'extra plastic' around the feet is not.  Thats a brim.  Its an option when slicing that produces an expanded area to increase adhesion for smaller or tricky parts.

You need to print something that doesnt have a brim and you only really need to print the first layer to check for your z height.  Something like the prusa logo has a reasonable area.  You can stop it after the first layer and check that its smooth, no wavy lines (indicating too low), no gaps when folded (indicating too high) but a single solid rectangle of plastic.