Summary

Remixed the side part to hold a filament runout sensor and a filter.
I use the little screw filter from EyeWolfDesign's Filament Filter/Sensor V2 at https://www.thingiverse.com/thing:2840455
I had to increase the filter by 1-2% for it to screw down tight.

I bought the sensor from Aliexpress, just search for "3D Printer Filament Break Detection Module"; I'm sure you can find the same sensor elsewhere.

Print Settings

Printer Brand:

Monoprice

                                            <p class="detail-setting printer"><strong>Printer: </strong>                     <div><p>Select Mini</p></div></p>                                                                                <p class="detail-setting rafts"><strong>Rafts: </strong>                     <div><p>No</p></div></p>                                                                                <p class="detail-setting supports"><strong>Supports: </strong>                     <div><p>Yes</p></div></p>                                                                                <p class="detail-setting resolution"><strong>Resolution: </strong>                     <div><p>Normal</p></div></p>                                                                                <p class="detail-setting infill"><strong>Infill: </strong>                     <div><p>22</p></div></p>                                                    <strong>Filament:</strong> Gizmodorks PLA                Black                    <br>                        <p class="detail-setting notes"><strong>Notes: </strong>                    </p><div><p>I left off the one peg on purpose, it fits better this way, still snug.</p></div>

MP Mini filament runout sensor holder

MP Mini filament runout sensor holder

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