Yep definitely use PLA or PTEG, as those are both safe and naturally-based ingredients that ants can handle.
Great job! Did you model this yourself? Looks nice!
Likely the problem with the slightly messy printing is that the filament is being extruded too close to the base, making it get messy and squished, and also potentially damaging the printer. Depending on what 3d printing software you are using (like Cura, for example), you may want to solve this problem in the settings, either on the printer itself, or the software. Fade height is one these settings. Another thing to do is adjust the plate height (where the 3d printed object is printed) to be lower, which sometimes involves screwing it down tighter with an Allen key or screwdriver. Finally, you can try to "realign Z axis" and "bed level" which I think may be a setting on your 3d printer as well. Personally, I use a pretty old printer, (an ancient Lulzbot Mini 2) so you may need to seek help for your specific model.
I'd probably google "how to stop 3d printer from extruding too close to the build plate" or something like that, for more specific help on your particular model.
Hope this helps!
Edit: I asked my dad about this after I sent this, and he said it could also just be the quality of the printer. If so, then there's just not much you can do.
Edited by Stubyvast, August 19 2024 - 4:35 PM.
Currently raising:
Myrmica rubra (1 queen + ~5 workers)
Lasius niger (single queen + ~90+ workers)
Lasius neoniger (3 single queen + brood)
Formica spp. (Queen [likely parasitic, needs brood])
Formica pacifica (Queen)
Also keeping a friend's tetramorium immigrans for the foreseeable future. Thanks CoffeBlock!