Negative pattern for creating Prusa Spool-holder arm receptacles

prusaprinters

<p>This design file is a tool that you use when you want to add a hole into any of your projects so that the stock spool-holder arms that came with your Prusa printer can be bayoneted into your own designs.</p> <p>This is useful for reducing the complexity of arm-based spool holders, and offers an approach to making all spool holder arms interchangeable. If we all decided to make our spool holders use the same exact bayoneted hole, then we could mix and match the different designs found here on the prints site.</p> <h3>Print instructions</h3><p>In the design file attached, you will find two shapes. One is a test print piece that was created by subtracting the negative from a simple cylinder shape. All of the internal bayonet ridges are stamped out by the subtract operation.</p> <p>The other part that looks like a solid cylinder with indents is the negative.</p> <p>To use this model, open the provided design file (tested in 3dbuilder), select the negative, and ctrl-c to put a copy into your clipboard. Then without closing 3dbuilder, create a new design (file menu) or open your own design that you want to add a spool holder arm receptacle to.</p> <p>Once the shape that you want to stamp a spool holder arm receptacle (hole) into is in your design space, press Ctrl-V to deposit the negative into your design space. Select the negative, drag it to where you want the hole, and position the negative inside of the shape you want to stamp an arm receiver into.</p> <p>To create the hole, use your shape editor's "subtract" function, making sure you have the negative in focus before executing the subtract operation. This will leave behind a hole that is the opposite of the negative. In this case, it will be a prusa spool holder arm receiver hole.</p> <p>The negative is built to print a two sided hole that is suitable for taking two of the Prusa bayonet ends on the ends of the arms. To do this, the resulting hole will be 30.5 mm wide - which is the width required to allow two spool-holder arms to snap in on opposites sides.</p> <p>When printing your now-holed positive shape, be sure to adjust your bridging parameters so the bayonet ridges don't get stringy.</p>