This is an optional step. If you are using a customized toolkit, jump to Step 7.

Download the model files for 1st Pen Holder.

Import the file to PrusaSlicer.

The model should be oriented same as shown in image 1. If not, change the print orientation.

Use Paint-on supports function to paint support areas inside the nut part, as shown in image 2. Then, select For support enforces only for Supports; select Prusament PLA for Filament.

Click Slice now. If set up correctly, you should see the similar support result shown in image 3.