Thank you so much! I will definitely not use 3D printed items in the cage then!
I have a good number of supervised-only toys, so I probably have no need for 3D printing then.
I really appreciate everyone for your help!

On the bracelets/ rings, they have to be at least 2.5" in diameter for safety reasons. Chunky gliders could get trapped

I would not use all four shelves, and maybe only one or two ladders.

I would use 2-3 shelves and swap the number of shelves every so often.
I have a DIY kitchen that can't be hung, so it needs a solid surface, so I have to use at least one shelf.

I also made the mistake of buying poof pouches, rather than ones in which they can see me coming from when I adopt them,
So I have to hang the poof pouches so that they rest on a solid surface, so that the opening of the pouch is facing the front of the cage
so that when I first get then I don't scare them when they suddenly see a huge new scary face peering down at them without much a visual warning.
(That's just for the first month or so till they warm up to me)

I believe they would have plenty of space to glide since the shelves are not the full depth of the cage.
I would have them also mainly positioned closer to the lower half of the cage, with more gliding availability towards the top.
Is that still ok?

I've heard they need some platforms, as climbing the side bars all the time cannot be so great in the long run, and also just a place they can stand/sit or whatever they do
Correct me if I'm wrong with any of this
(also no need to apologise for the late reply I understand )

I'm not very familiar with 3d printing.

There are filaments that are food grade and safe for gliders.

What type of toys are you planning to make? There are rules about minimum and maximum openings.

Can you 3D-print toys for gliders?
Is it safe?

I don't know if its toxic if they try to chew on it.

I might make things like rings they can carry around, or balls/other 3d shapes for a toy pit, or hanging cups with hooks built in for hanging. (if safe)

I just don't know if its safe.

The items probably would not be completely smooth, and I don't know what type of plastic is used.

I use about 1 cup white vinegar to a gallon of water. It helps release the urine and their marking smell.

I do a quick rinse, the vinegar smell goes away once it's washed again and dried. A slight fragrance is fine. I set my laundry load up for a second rinse to make sure.

Its ok for the fleece to be warm when it comes out of the dryer. Following these guidelines will extend the life of the fleece.

Mine is some weird one I can't remember the name of
What's the vinegar-to-water ratio you use?
My laundry comes out warm from the dryer with a light scent to it, but it's an unscented detergent
Is that ok?
The scent is not strong, but I don't know if that's just normal
Would I have to ensure the vinigar scent it 100% out of the fabric before washing to ensure scent familiaryity?

I don't have gliders yet, but will the general new scent of the cage be super overwhelming for them?
And if they pee on everything to familiaryize scent and it smells super bad, should I wash them or not because of that?

I don't think the current fost home can have them use the pouches before adoption

(sorry thats a lot)

What detergents are safe?
Is any brand safe as long as it meets a certain requirement?
How to wash?
With other laundry items or not?
Does the water temperature matter?