Desktop case for HP MCR22IN1 22-in-1 card reader

prusaprinters

<p>From an old HP/Compaq computer, I rescued a card-reader normally mounted in a 2.5" drive bay.</p> <p>I designed a case for it that uses the original screws to hold it in.</p> <p>The back is completely closed and the cable, which has a 2x5 JTAG Header connector, is passed through a hole, which is plugged by a strain relief.</p> <p>To connect the unit to a computer, a cable with 2 USB plugs, and 10-pin header connector on the other end of the cable is required, but I could only find those for USB 3, and the pin layout is too different for it to be used.</p> <p>I found these on AliExpress:<br/> <a href="https://www.aliexpress.com/item/USB-2-0-Type-A-Male-to-5-Pin-Female-Header-Motherboard-Adapter-Cable-50cm/4000510855924.html">https://www.aliexpress.com/item/USB-2-0-Type-A-Male-to-5-Pin-Female-Header-Motherboard-Adapter-Cable-50cm/4000510855924.html</a></p> <p>As this is a single connection, you'll need 2 of these.</p> <p>To connect the three cables to each other, you will need these;<br/> <a href="https://www.aliexpress.com/item/33002590998.html">https://www.aliexpress.com/item/33002590998.html</a><br/> (You'll need 1 set of these)<br/> Well actually, you only need 9 pins, but you probably have to buy all 400 :P (but if you find a smaller amount, or a friend who can spare 9 pins ...)<br/> Just make sure they have 6mm of metal on both sides. If one side is shorter, it is for soldering to a PCB, and these will not make a good connection.</p> <p>For v2 of the strain relief, you will need 2 M3x6 screws. If you have only longer screws, use washers; the screws should not protrude more than 1 mm.</p> <p>A tie-wrap is used to prevent the cable from being pulled out.</p> <p>I do not yet have an elegant solution to prevent the cable from accidentally disconnecting the connectors, will add that when I find one.</p> <h3> Print Settings</h3> <p><strong>Printer Brand:</strong></p> <p>Creality</p> <p><strong>Printer:</strong></p> <p>Ender 5</p> <p><strong>Rafts:</strong></p> <p>Doesn't Matter</p> <p><strong>Supports:</strong></p> <p>No</p> <p><strong>Resolution:</strong></p> <p>.2</p> <p><strong>Infill:</strong></p> <p>35%</p> <h3><strong>Filament:</strong> Extrudr GreenTEC (PLA-ish) GreenTEC Black How I Designed This</h3> <p><strong>The HP 22-in-1 card reader MCR22IN1</strong></p> <p>This case consists of two parts. The large part is of course the case. This is a slide-in case, and since the cable has a 13x5 mm (-ish) connector, there is a rectangle hole to put the cable through.</p> <p>The small part acts as a strain relief for the cable and at the same time to plug the rectangle hole in the back for the cable.</p> <p>Now, v1 of the strain relief gave me a few pains as it would tip over just before the unit was completely slid in the case, so I redesigned it to be mounted on both sets of threads;</p> <p>Strain relief v2 is using 2 M3x6 screws to hold the strain relief in place to prevent sliding, the two poles on the sides to prevent rotation. In v1, a massive block in the middle was supposed to do that, but these two smaller ones do the job just fine and we save some material in the process.</p> <p>While printing, however, I thought of a slightly different way; v2 slides horizontally over the threads in the middle and down at the end, requiring the two poles to keep it down.</p> <p>Strain relief v3 slides horizontally over the threads at the end and down on the threads in the middle. The upward motion at the end is no longer possible, making the poles obsolete. v3, like v2 requires 2 M3x6 screws.</p> <p>All versions of the strain relief fit snugly over the cable. When the unit is slid into the case, the screws from the outside will hold the strain-relief/hole-plug in place.</p> <p>The case has a few rectangle grooves to accommodate the grounding spring strips that the unit has on the bottom. The grooves prevent the plastic from warping under the strain and keep the unit neat :)</p> <p>About the cable hole in the back;</p> <p>I could have designed a 5mm hole only, but that would require removing all the Dupont pins from the header connector and re-inserting them afterwards. This seemed easier :)</p> <p><strong>Assembly</strong></p> <p>The slightly extruded thread, excellent for holding something in place. There are 4 of these points in the unit, but the strain relief only uses 2.</p> <p><strong>V1 slides from top down over the extruded threads.</strong></p> <p>v2 of the strain relief uses all 4 of these points. With 2 M3x6 screws, the part cannot slide back, the poles on the ends keep it down.</p> <p>(While designed to be held in place with 2 screws, I noticed that the part actually stays in place perfectly without. But better sure than sorry ...)</p> <p><strong>Strain relief v2</strong></p> <p>v3 of the strain relief also uses all 4 of these points. But this one slides over the back-side-threads, which will hold the part down, and then rotates down over the threads at the middle. This will prevent sliding back. With 2 M3x6 screws, the part cannot rotate back up or slide back, the poles on the ends are no longer needed.</p> <p><strong>Finished product</strong></p> <p><strong>Case closed ;) This is the backside of the case.</strong></p> <p><strong>Connection</strong></p> <p>(at the time of writing, I do not yet have the cables to connect to a computer, so I cannot show you that yet)</p> <p><strong>The 9 required header pins, 6mm metal on both ends</strong></p> <p><strong>Pins connected to the cable, ready to receive the USB-to-header cables</strong></p> <p><strong>Shopping list</strong></p> <ul> <li>1x HP MCR22IN1 card reader</li> <li>9x header pin male-male, square pins, preferably</li> <li>2x M3x6 screw of your liking (Hex, Philips, .., your choice)</li> <li>2x USB2.0-A to header cable</li> <li>1x tie wrap </li> </ul> Category: Computer