Summary

Don't want to drill holes in your C64 case for your new SIDFX?
https://www.sidfx.dk/
Print this cover, slide both switches and the audio jack through from the inside and press the cover onto your Cassette-Port from the outside.
Be gentle, the tabs are very brittle.
It's a snug fit, but worked fine on a C64C

Print Settings

Printer Brand:

Prusa

                                            <p class="detail-setting printer"><strong>Printer: </strong>                     <div><p>i3 MK3</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>0.2mm</p></div></p>                                                                                <p class="detail-setting infill"><strong>Infill: </strong>                     <div><p>100%</p></div></p>                                                    <strong>Filament:</strong> Fillamentum PLA                Rapunzel Silver                    <br>                        <p class="detail-setting notes"><strong>Notes: </strong>                    </p><div><p>Print with flat side down</p></div>

How I Designed This

Designed in Fusion 360:rnhttps://a360.co/2SMMTpx

C64 SIDFX Cassette-Port Cover