Owala boot and shoulder (actually protects)

This model is designed to be printed with TPU and a very specific configuration of settings to keep it as soft as possible.

Boot settings (already in 3mf)

• Use a 0.4mm nozzle with all line width set to 0.45mm (important!)

• Use 1 perimeter and 10% gyroid infill

• Set the number of bottom layers to 2-3. Reduce the minimum bottom shell thickness to 0.4mm and set “Ensure vertical shell thickness” to Partial or Disabled

• Set the number of top layers to 2, reduce the minimum top shell thickness to 0.4mm

• Use Concentric for the top fill pattern and bottom fill pattern

• Use a height based modifier from 5 to 35mm to set 0% infill and zero top layers. Having no top layers helps the waves have maximum cushioning effect.

• Add a cylinder modifier object. Instantiate it at the same coordinates as the model and set it to 68x68x6mm (60x60x6mm for 16oz). Set this object to 0 top layers. This will expose the gyroid pattern and maximize the softness of the infill by not restricting its movement. This also ensures there is no trapped air in the model, which would make the TPU stiffer.

Shoulder settings (already in 3mf)

• Use a 0.4mm nozzle with all line width set to 0.45mm (important!)

• Use 1 perimeter and 0% infill

• Set the number of bottom layers to 2. Reduce the minimum bottom shell thickness to 0.4mm and set “Ensure vertical shell thickness” to Partial or Disabled

• Set the number of top layers to 2, reduce the minimum top shell thickness to 0.4mm

• Use Concentric for the top fill pattern and bottom fill pattern

• Use a height based modifier from 1.4 to 20mm to set zero top layers. Having no top layers helps the waves have maximum cushioning effect.

If your TPU under-extrudes, you will not have the inner cylinder connected to the outer perimeter waves. I recommend you print the "shoulder" first. This will let you see if you are under-extruding and is a smaller object to test your settings.

If you have a clear TPU (CookieCad Funfetti in my last photo), it looks better when you use very large layer heights. However, the initial overhangs prefer normal size layers. Accomplish this in the following way for the Boot.

• Keep the profile at 0.2mm layers

• Use a height-based modifier from 3 to 5mm to change the layer height to 0.25 or 0.3mm

• For the height-based modifier from 5 to 35mm that changes the infill and top-layers, set that to also use 0.25 or 0.3mm layers

For the shoulder, you can split the 1.4 to 20mm height modifier into two sections, one from 1.4 to 3mm with 0.2mm layers, and one from 3 to 20mm with thicker layers and zero top layers.

If the boot is too loose you can either add scotch or double sided tape to the water bottle, or reprint it at 99% size on X and Y.