BearingPeg 2.0 - Customizable FreeCAD

prusaprinters

<p>This is a <a href="https://gitlab.com/FloatingCam/devenv/freecad/settings-spreadsheet">'parameterized' FreeCAD model</a> of the <a href="https://www.prusaprinters.org/prints/3094-wall-mount-spool-holder-with-bearings">BearingPeg</a> I created from the Prusa MMU2 tray bearing.</p> <p>This publication includes several different versions of pegs based on observations I've made and comments I've received. These were all made using the <a href="https://gitlab.com/FloatingCam/devenv/freecad/settings-spreadsheet/blob/master/BearingPeg.py">.FCStd file</a> which demonstrates an interactive FreeCAD model.</p> <h3>History</h3> <p>I ran across a download for a part I needed that included a FreeCAD model and talked about customization. I was curious as to how they had customized a FreeCAD model and surprised when the changes I made to the spreadsheet were instantly reflected in the view.</p> <p>Version 1.0 of the BearingPeg was a POC that worked so I printed five and was done. I thought about making a shorter peg and really liked the idea of a single hole version but couldn't justify the effort.</p> <h3>Customize</h3> <p>After seeing that an interactive model was possible I decided to see how hard it would be to <a href="https://floatingcam.com/blog/bearingpeg-customization/">Parameterize my BearingPeg</a></p> <p>Now it is possible to change:<br/> -Bearing Size<br/> -Axle Size<br/> -Width<br/> -Length<br/> -Hole Separation<br/> -Spool Bearing location<br/> -more...</p> <p>See for yourself: <a href="https://www.youtube.com/watch?v=GEhgrSl4hL0&amp;feature=youtu.be">https://www.youtube.com/watch?v=GEhgrSl4hL0&amp;feature=youtu.be</a></p> <h3>Interactive FreeCAD</h3> <p>If you use FreeCAD, even if you don't need a wall peg, it is worth <a href="https://gitlab.com/FloatingCam/devenv/freecad/settings-spreadsheet/blob/master/BearingPegV2.FCStd">downloading the .FCSTD file</a> to see an interactive FreeCAD model in action. I was able to do everything using just the standard FreeCAD installation.</p> <h3>Print instructions</h3><p><strong>Printer Settings -&gt;</strong> Original Prusa MK3S</p> <p><strong>Print Settings -&gt;</strong> 0.20mm - Speed MK3<br/> <strong>Perimeters:</strong> 3<br/> <strong>Solid layers - Top:</strong> 5 <strong>Bottom</strong> 4<br/> <strong>Fill density:</strong> 20%<br/> <strong>Fill pattern:</strong> Grid<br/> <strong>Top/bottom fill pattern:</strong> Rectilinear<br/> <strong>Rafts:</strong> No<br/> <strong>Supports:</strong> No</p> <p><strong>Filament Type -&gt;</strong> Generic PET<br/> <strong>First Layer:</strong> 225<br/> <strong>Other Layers:</strong> 225</p> <p>You will need the following parts (or their equivalent) from the Prusa Filament Trays.</p> <ul> <li>10x 608 Bearings</li> <li>5x 8*120mm Aluminum Tubes</li> </ul> <h3>Assembly</h3> <ul> <li>Push 608 bearing into wall mount but not all the way to the bottom.</li> <li><p>Optional: Slide two of the rubber grommets onto the axle. These have to be positioned to ride evenly on the inside hub or the spool may tilt a bit. Works fine without these.</p> </li> <li><p>Slide the other bearing onto the 120mm tube <img alt="" src="https://cdn.thingiverse.com/renders/f3/f6/f2/cb/26/e5f5d0256b56382359726fbc0f6f1cbf_preview_featured.jpg"/></p> </li> <li><p>Position the tube so it can be inserted into the wall mount bearing with the outer bearing positioned above its slot. <img alt="" src="https://cdn.thingiverse.com/renders/6a/a6/a7/c4/db/6afe615efedaa8d2b4e173c166694f6a_preview_featured.jpg"/></p> </li> <li><p>Push the tube into the bearing until it clears the outside edge and can be pushed into place. <img alt="" src="https://cdn.thingiverse.com/renders/f2/7c/5e/f5/81/10485258956412c25f00e94f766effde_preview_featured.jpg"/></p> </li> <li><p>Push on the rod near both bearings to press them into their place. <img alt="" src="https://cdn.thingiverse.com/renders/43/53/b8/b5/1e/a6b70610fe3225a0e4f79729edf138de_preview_featured.jpg"/></p> </li> <li><p>Verify the axle turns freely.<br/> <img alt="Assembled Peg" src="https://cdn.thingiverse.com/renders/96/63/01/4e/83/21e440a1a9ade202183ecce3620d9107_preview_featured.jpg"/></p> </li> </ul> <h3>Files</h3> <p>I've included 4 versions of each configuration:</p> <ul> <li>Single Hole Center Mount</li> <li>Single Hole Top Mount</li> <li>Two hole mount at 40mm separation</li> <li>Two hole mount at 40mm separation with the mounting holes moved 10mm up</li> </ul> <p>These are the configurations for each version listed above:</p> <ul> <li>Spool bearing at 75mm</li> <li>Spool bearing at 80mm</li> <li>Axel length of 100mm, no spool bearing</li> </ul> <p>My choice is the OneHoleTop 75mm version. I found the OneHoleCenter spun out the wall anchor and the peg could spin. I believe it would work screwed into wood (or better wall anchor) but the OneHoleTop seems to work fine regardless of the wall anchor.</p> <p>These STL files were provided to demonstrate how easy it is to customize pegs.</p> <h3>File Naming Convention</h3> <p>BearingPeg<em>&lt;#SpoolWidth#&gt;</em>&lt;#HoleSep#&gt;_&lt;#AddHeight#&gt;</p> <p>Example:<br/> <strong>BearingPeg_OneHoleCenter_80</strong></p> <p>The default Axle length is 120mm (from the Prusa MMU2 tray). Zero hole separation and the spool bearing is 80mm from the hub.</p> <p>BearingPeg100 is a shorter version (100mm vs 120mm) and uses the full peg so there is no spool bearing slot.</p> <p>The purpose of this effort was to create a version that could be customized. The models I included should meet most needs but it is super easy to customize your own if they don't.</p>