A Test tube holder for your brooding queens
instead of having to disturb them with moments etc you just take the lid of to see how they are doing.
16mm variant and 20 mm variant.
I added a version 2 for the 20mm variant, the holes are now 20.5mm wide instead of 20mm snug.
I made a version 2 where the tubes are further apart:
printed fine, photo's show the end product!