Gary,
I tend to forget that most people do not have the same luxuries as others and when I built my gecko building there were certain high priorities that I addressed from the start:
1. Ceiling height is 7 foot. I can easily stand flat footed and completely palm a gecko against the ceiling if necessary.
2. Vents – all are lined with window screen.
3. Every crack of the room is caulked and sealed. If a baby Sphaerodactylus gets out – he’s setting on a concrete floor with nowhere to hide.
4. Every terrarium I have is located on a rack system that is supported by castors (wheels). Something runs around the back of the outside of the cage – fine, I pull the rack out immediately and capture.
5. I have capture nets (little aquarium nets) hanging on the end of nearly every rack that I have (about 30 nets!).
Essentially, if something flies out, it might take me a few minutes, but I’ll get them one way or another! I really try to simplify my rooms, remove all clutter and trash, and keep things very organized and simple.
Yes, I use piles of the 32 oz insect cups for raising any arboreal gecko species that is less than 4” TL at birth. The trick is to only lift one portion of the lid gently with a finger or two (about 10-20% of the lid). Watch the gecko and toss food in. (I should make utube videos on this stuff – it makes explaining a lot more effective!) I think the real trick is learning to sling the crickets through that gap in quick fashion and thereby not allowing the gecko adequate time to escape. I feed roughly 800 geckos or so in this manner, so I’m certainly hearing what you’re saying
Jon