Change log:

• 03.08.2025 - v2.1 released. Much better sizing for the one.pice model.
• 02.06.2025 - A one-piece model v2 for printing with TPU added. STEP file can be downloaded. Some dimensional inaccuracies adjusted.
• 25.04.2024 - First release published v1

Please note: 

The hardcase is the first version and works well for me. There is still room for improvement which I will implement in later versions:

• Some of the upper switches are a little difficult to operate with big fingers. 
• A large USB plug might not fit. 
• Depending on the printer and filament, the rear fit (triangle) may only just fit. Possibly sand down a little.
• The material on the back in the area of the camera insert is very thin (0.6 mm) and can be damaged when detaching from the print bed or when removing support material. This is not a problem when mounted.

For all those who would like to print the case with TPU, If you have a suitable print bed (275 mm), you can easily print it.

When I held the Galaxy Tab 9+ in my hands for the first time, it almost slipped out of my hands. I took this as an opportunity to design an all-round protection for the thin and sensitive aluminum as quickly as possible, which would also improve the grip when using it with my hands. Unfortunately, the dimensions of the tablet are larger than the print bed of my 3D printers, which is why I decided to build it in two parts. My first attempts started with a soft case made of TPU, which in my opinion is far too soft for a two-part case. So I decided on a hard case made of ABS. PETG or PLA should also work, but I didn't test them. The two individual parts are connected by two small slots that click into place and a triangular form-fit on the back.

figure 1: Side fit

figure 2: Rear ‘triangle’ fit

Please write to me if something needs to be improved.

Assembly

Before assembly, please deburr the edges and surfaces of the rear 'triangle' fit and sand them down a little.

After deburring, the two parts must be slid over the Tab 9+ from both sides. Start with the left-hand part with the hole for the camera first. Slide it carefully onto the device as far as it will go. Then the right-hand part can be pushed until the 'triangle' on the back is level with the left-hand part. Now lift the 'triangle' slightly with your finger so that it can be pushed over the edge. With a little pressure, the right-hand part can now be pressed into the outer locking holes. Once the two parts are completely closed at the outer edges, the 'triangle' on the back can be carefully pressed into the fit. To do this, hold the palm of one hand opposite the screen surface and press on the 'triangle' with the thumb of the other hand until it slides into the fit. If this does not work with little pressure, the edges must be adjusted with some sandpaper. 
Be careful:
Please do not press too hard on the rear 'triangle' otherwise the tablet could be damaged.

Printing v1:

• Filament: ABS (PETG, PLA may work but not tested)
• Layer: 0.2 (0.4 nozzle)
• Wall: 4
• Filling: 20%
• Support: Yes

Printing v2.1:

• Filament: TPU
• Layer: 0.2 (0.4 nozzle)
• Wall: 2
• Filling: 10%
• Filling pattern: Gyroit
• Support: Yes (Tree, only on printing plate)

Figue 3: OrcaSlicer after slicing of v2.1

Have fun!