Is it safe to stick googly eyes on the toolhead?

Ran googly eyes on my Snapmaker 2.0 toolhead for over a year now, so I can give you the long-term report. The adhesive question is the real one, because the front of that toolhead does warm up during long prints. Craft glue peels right off after a few weeks. What actually worked for me was 3M removable mounting strips, the small picture-hanging kind. They hold through heat cycles, they come off clean with a gentle pull when you need the toolhead apart, and they've got enough thickness that the eye sits proud of the plastic without touching anything. I've pulled the front panel off twice for fan maintenance since and both times the eyes just came along with the strip and went straight back on. Your airflow worry is the one I'd take seriously though. On the 2.0 the cooling intake is right there on the front face, and a big pair of eyes can partially cover it. Mine are small, maybe 12mm, and I positioned them high on the front face away from the slot. Even then I checked with the fan running that nothing was close enough to get sucked in. If the googly eyes you bought are the chunky ones, either size down or find a spot on the side of the toolhead instead. Loose eyes rattling into the fan is a real possibility with big ones, since the pupil is just a loose disc inside a plastic shell, so give the mounted eye a flick test before you run a print. Painter's tape does look rough, but your wife's instinct about removability is right. The mounting strips split the difference: they look clean like a proper mod but they release like tape. As for whether it lasts, mine went on as a joke and stayed on because the kid named the printer and now it would be mutiny to remove them. There's one small novelty benefit I didn't expect: the eyes wobble when the toolhead moves fast, and it's genuinely easier to spot a failed print from across the room because the head keeps flying around like everything's fine while the model stops growing. So yeah, months in, still stuck, still cute, zero problems.

I'd push back on the wobble trick being a perk. Wiggling eyes on a toolhead would drive me nuts during long prints, all that peripheral motion while trying to watch a first layer go down. Mine have been on a few months and I glued a tiny dab of clear silicone under each pupil shell so nothing moves. Still looks silly, way less distracting. Curious if anyone else finds the moving parts more annoying than charming.

This thread made me laugh becasue my kid did the same thing after seeing a video of a printer that looked like it was watching itself work. We haven't stuck anything on yet, still reading ideas here. One thing I noticed though, the little sticky pad on the back of some googly eyes is basically the same stuff as those glue dots kids use for crafts. Ours held fine on the wall for months but I have no idea how it handles a warm surface. Does the front of the toolhead actually get hot enough to soften glue like that, or are we talking just slightly warm to the touch? Still figuring out what counts as too warm.

We did this on our Artisan, diferent beast but same idea. Went with the smallest eyes we could find and stuck them on the side of the housing instead of the front, zero chance of covering any vents that way. They've survived maybe six months of weekend printing, though the wobble died after a while and they just stare blankly now. My daughter renamed the printer twice since, so the eyes are basicly permanent residents at this point. Funny how a silly joke mod ends up outlasting the actual upgrades I've made.

Here, the material that made the difference was good old double-sided foam tape, the thin kind from the hardware store. Stuck a pair on my Snapmaker two winters back and they never budged, but the foam compresses enough that a fingernail gets under them when I need them gone. I also put mine near the top corner of the housing so a loose pupil would have to travel sideways to reach anything important. Only issue so far is dust, the plastic shells get grimy and need a wipe now and then. My kid says the printer blinks when it's tired, which is apparantly when it needs a filament change.