I decided to make this design after I realized my LTT Commuter backpack had a severe issue with falling over, no matter what I tried. Their official solution was to buy their $60 "Bag of holding," which I was not about to do. I started using a glass Tupperware dish that perfectly fit the bottom of my bag and worked great, but I decided to use my design knowledge and more engineering focused materials to make something more viable, less dangerous, and better designed for the task.

This print is designed to be printed in vase mode with a 0.8mm line width (I used a 0.6mm nozzle for this). The design features 1.5mm thick walls, which allow the vase mode print to weld them together. Additionally, there is an offset zig zag overlap/gap, which allows the layers to weld together.

HIGHLY RECOMMENDED: Use PETG or, better yet PETG GF for maximum rigidity and layer adhesion. It's cheap and very easy to print, even open air.

Print settings used:

100% Scale
0.6mm Nozzle
0.8mm line width
Elegoo PETG GF (Black)
260C Nozzle
65C Bed
0.3mm layer height
120mm/s walls (Lower or raise to your printers capability)
Fan 100%
Print time ~70 Minutes on my Centauri Carbon