I created this model because I could not find anything else that had a similar design. Specifically, this model is designed to catch all of the dust dropped from the incense while burning. The angle of the incense holder allows predictable droppage and multiple holes allow you to load up multiple incense - saving time on reloading. I've used this model for 3 years now and have printed two copies over that time.

Regarding safety: As noted above, I've used this for a few years - printed in PLA and in that time I've not had any issues regarding safety. However, I cannot be responsible for safety in your particular situation. Sometimes a hot coal will fall in the holder, and I have some melted areas in the bed of the plastic as a result. Those don't bother me though and generally they get covered by incense dust anyway. You could print in something more heat resistant than PLA, but I designed this early on in my printing journey when PLA was pretty much the only filament I was using.