@Jake Hi, make sure your software is the latest version and choose the correct printer.

@Nano Yes,you can try online slicer with this link:
https://slice.wiibuilder.net/kiri/
1.Firstly,click "Setup" -->click "Machine" as below:

2.Then choose your printer type.If your printer is TINA2,choose "TINA2" :

When you finish setup TINA2，you can load 3d model to slice by click"Start"-->click "Slice".
Finally export the gcode file by clicking "Export" and copy it to micro sd card,and insert the card to TINA2 to print 3d model.

Complex models require low-speed printing,fast maybe the issue.You can try to slow printing.

@K-T I tested Wiibuilder 2.5.0.2 ,and it can be opened normally both on my MacBook Air 2013 with Mac OS 10.15 and MacBook Air M1 2020 with Mac OS 14.4.1. You can try it out. If you still can't open the software, you can use the open source Cura 5.3 or above, which also has Tina 2 in it.

@K-T Hello,I need to know a few things before I can provide the software:
1.Which version of the damaged software is ? For example, Wiibuilder 2.2.1.0, Cura 4.10.0.
2.What system does your computer have? Windows or macOS, and then which version of the system? For example, MacOS 10.15, Windows 7, etc.
3.Which brand is your Tina2? For example, ENTINA TINA2, WEEFUN TINA2.

Is the dimension of the 3d model you uploaded in millimeters? If it is in metric units, the size of the file after reading will be too small and cause failure.
When you export the stl file, please make sure the unit is millimeters and the maximum size is greater than 1mm.

Hello,you need 3D design software to create your own design.
Here are some popular 3D design software ：
On desktop：Blender,SketchUp, 3DMax,
On web brower: Tinkercad
On mobile platform: SketchUp,Tinkercad

@Jake Hi, make sure your software is the latest version and choose the correct printer.

@Sorwhitwrose1998 Hello, from your description, it seems that Tina2 was chosen in Wiibuilder.
Tina2 and Tina2S use different protocols for serial communication and WiFi communication, and incorrect printer selection may cause connection failure.
When you choose Tina2s in Wiibuilder, the software does not have the ability to upload files with serial connection, it sends the Gcode to the Tina2s line by line instead.