Desk sign holder + blank plate

Desk sign holder printing: 
0.3mm layer height
6 walls
10-20% infill
3-4 top/bottom layers
Add some manual supports on the front lip and paint red everywhere else where your slicer tries to add supports.

Insert plate printing:
0.3mm layer height
2 walls
20% infill
4 top/bottom layers
 
Letters looks nice with cubic infil. You can stop the print after a few layers and leave it like that.

How to add text with thinkercad: 
1. Open thinkercad
2. Import stl model of the blank plate.
3. Select TEXT option from shapes menu on the right.
4. Add and configure text.
5. Select both text and plate. 
6. Press ctrl+g or group option
7. Export stl.