I didn't care for putting unnecessary holes into my walls so with some inspiration from another project I came up with this clip. The Somfy Solar panel is just long enough that these will fit on opposite ends of the battery and allow the panel to hang just below it. I printed it out in PLA and it fit perfectly on my blinds, however since they will technically sit in sunlight it may be better to print them in ASA... time will tell.

This is a remix/combination of the following:
https://www.thingiverse.com/thing:3987333
https://www.thingiverse.com/thing:616283

Somfy Solar Panel Valence Clip

Somfy Solar Panel Valence Clip.stl

I created this to plug the inlet hole on the Mars Mate when I'm not using it and its detached from the printer. This is just to keep the creepy crawlies from trying to make a home inside. 

I created this in Tinkercad so it's not pretty, but it gets the job done with little effort on my part.

There are 3 versions so if the main one doesn't work try the loose or tight fit files.

I printed this on my K1 Max using Creality's Hyper PLA
.20mm layer hight
Thin tree support set to 75 degrees. Just enough to touch the center of the finger indents on the top.

Elegoo Mars Mate Air Purifier Storage plug

Elegoo Marsmate Air Purifier Storage plug.stl

Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4410526.

I originally had robathome's Ender 3 Filament Guide(remix of Holspeed's filament guide) installed on my printer. When I upgraded to the 3DFused Linear rail kit I found that the guide would no longer fit due to the width of the spacers installed with the new rails.
I downloaded the .stl file for the spacer off the 3DFused website and using Tinkercad opened up the space required on the bracket + a bit more to make sure it cleared the spacers if they expand during printing.
The fit is pretty good if I say so myself. It does sit a little loose, but once the filament is run through it stays put (you could probably stick a piece of paper in to snug it up but I didn't find that it was needed).

Note: This is the bracket only. The rest of the parts are the same ones used in robathome's thing and can be downloaded there.
https://www.thingiverse.com/thing:3061551

Ender 3 Filament Guide for 3DFused Linear Rails

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Somfy Solar Panel Valence Clip

Elegoo Mars Mate Air Purifier Storage plug

Ender 3 Filament Guide for 3DFused Linear Rails