Magnet filament coupler for drybox

prusaprinters

<p>Magnetic filament coupler with ring magnets to get a easy access to the filament or detach the spool-part from the printer.</p> <p>The goal was: keep it simple and easy.</p> <p>4 mm ptfe tube fits snuck into de hole of the magnet.<br/> The petg cap gives you a firm grip on the coupler.</p> <p>Do not use this on the Bowden tube to the extruder in a real Bowden setup.<br/> This is for the supply from the spools too the printer.</p> <h3>Print instructions</h3><p>You need neodymium ring-magnets with a proper chrome or nickel coating : 4mm inner hole, 10 mm outer diameter, 6 mm height. It is a common standard available magnet.</p> <p>I used 5 degr. higher temperature on petg for a good adhesion of the layers and on the bed. I also increased the extrusion factor to 1.05.</p> <p>Clean the model after printing for a strong fit of the tube and the magnet. You can change the dimensions in the fusion file with the parameters (yes, parametric fusion file) or change the dimensions a little bit in the Prusa-Slicer.</p> <p>Chamfer the tube a little bit on the outside to get more easy the tube in the magnetic ring. Do not cleanup the inner hole of the magnet, it will damage the magnet, it is very brittle and will start to oxidize the neodymium without the protective coating.</p> <p>Before you put completely the magnets in the caps, check if they attract each other (it's sound stupid, but it will happen). The magnet should not stick out the caps, but be on the same height, so you get a strong magnetic attraction and some protection of the magnets when put together.</p> <p>Last change :</p> <p>Added an extra inner diameter for the top tube for the section near to the magnet. For some reason the inner diameter was smaller on that section of the printed part (where the outer part was bigger). Has something to do with the forces in the plastic when cooling down I think.</p> <p>Added also the slicer projectsettings.</p> <p>13-2-2021 : Added the fusion 360 file with parameters.</p>