Accessorize your I3MK4S' frame with this clamp and text together. You add custom text by combing the models in your slicer.
Print on it's back with supports, do not use “tree/natural” supports, they are harder to remove from the print. The letters will be small, and if the supports stick to the model removing them may also remove the letters.
The steps for custom text is simple!
Import the mesh from OpenSCAD and move the text to the top of the clamp. Then merge the models in your Slicer.
In-lieu of installing OpenSCAD, you can use the web version of OpenSCAD to render and export the mesh of your choice, and add it to the clip. This may have font issues, but it worked for me.
Arrange in your Slicer:


Used @Lyl3 "Dual Letter Blocks Illusion Customizer" (CC-BY-SA) OpenSCAD file to make the text, and merged it a cut version of the model from @YTMA_1676212's “Humidity and Temperature Sensor Adapter / Holder / Mount - for "Printer Frame" Prusa MK4S” (CC-BY).
The author remixed this model.
The text tool from @Lyl3 is placed on a clamp.
The mount from @YTMA_1676212 is cutoff to allow placing of text on top of the frame.