This is a Crab shaped aquarium fish feeding floating window. 3d prinabe. Hollow inside. Low cost to print. Use any plastic materials to print it. Thickness of the tube is 0.8mm. Scale the 3d model according to your aquarium size. Best fit with small aquatic herbs or floating plants. Printing resolution should be less than 0.1mm.
Custom size and design possible. You have to contact with me for moe details.
Thanks, Mahbub