Retractable Rosin Case

prusaprinters

<p>This is a rosin case that extends and retracts the rosin using a screw. It is suitable for Hill rosin that comes attached to a piece of fabric with an elastic band. I would often drop my rosin or knock it off the table, invariably damaging the rosin - until I made this case,</p> <p>You will need:</p> <ul> <li>A machine screw, #8x24 or #8x32, 1 1/2" long;</li> <li>Two #8 nuts;</li> <li>A #8 brass insert matching the thread count for the screw you're using (I used<strong>these</strong>);</li> <li>A reamer;</li> <li>Some Loctite Threadlocker or JB-Weld;</li> <li>Some adhesive for plastic (I used SciGrip #16);</li> <li>A hot glue gun.</li> </ul> <p>After printing the parts, assemble everything using these steps:</p> <ul> <li>Insert one #8 nut into the hex-shaped recess in the 3D printed plastic nut.</li> <li>Insert the screw into the plastic nut from the other side, and screw in all the way until it's tight. If you want you can apply Loctite to the #8 nut, but it's probably not necessary.</li> <li>Ream the hole in the body to a size suitable for your brass insert. The hole is designed to be small so you can ream it to an exact fit. If you don't want to use a brass insert, alternatively you can tweak the design to make the hole even smaller, and then tap it to accept your screw threads.</li> <li>Tap in the brass insert, gluing if desired.</li> <li>Insert the screw through the brass insert from the bottom, and screw it all the way.</li> <li>Insert the screw through the plate bottom, with the larger round opening pointed up.</li> <li>Put a second nut on the end of the screw, tightening until it is flush with the end of the screw. Apply Loctite or JB-Weld to this joint to make sure the nut does not loosen. The nut (and screw) should be able to turn freely in its recess however.</li> <li>Glue the plate top to the plate bottom, enclosing the nut. The bumps on the plate top should be pointing up.</li> <li>Let the glued components, Loctite and/or JB-Weld dry.</li> <li>For Hill rosin, cut off the fabric around the rosin at the base. Hot glue the rosin (with remaining fabric attached) to the plate top.</li> </ul> <p>That's it! Now you can use the plastic nut at the bottom to extend and retract the rosin. Retract it and use the provided cover between uses.</p> Category: Music