Multi-Function Pen with a Metric Ruler, Nut and Screw Sorter. Magnet and a 4mm Bit Holder

prusaprinters

<p>This is my entry in the <a href="https://www.prusaprinters.org/contest/21-pens-and-pencils">Pens and Pencils Contest</a>. &nbsp;It's a pen like any other, but also has the following features:</p><ul><li>135mm Metric Ruler (the first 10mm at the bit holder end are not marked)</li><li>Metric Nut and Screw Sorter (M2, M2.5, M3, M4, M5 and M6 sizes)</li><li>4mm Bit Holder</li><li>A magnet (optional)</li><li>It also has a groove in the ruler to help with marking filament to calibrate e-steps.</li></ul><p><strong>Parts Needed:</strong></p><ul><li>1x pen “refill” pulled from a generic BIC pen (see the pics)</li><li>1x <a href="https://www.harborfreight.com/10-piece-rare-earth-magnets-67488.html">8x2</a> or 8x3mm cylinder magnet (Optional)&nbsp;</li></ul><p><strong>Printing Suggestions:</strong></p><p>I printed some of my initial version with 0.1mm layer height, but found that 0.2mm works as well. &nbsp;I would stick to those however due to the pen having a ruler. &nbsp;This will not need supports, but I recommend using a brim, unless your printer has fantastic adhesion. &nbsp;This is because the parts are set up to print in the tall orientation, and there is not much to hold it to the bed unless a brim is used. &nbsp;It will also help to print this slower than normal, since that will help with minimum layer times and vibrations since it is printed in the tall orientation (I used 30mm/s). &nbsp;</p><p><strong>I added a small test part to print prior to printing the whole pen, this will test that the pen refill will fit the print. &nbsp;Please print this quick model first to make sure your pen refills will fit, it is called “Pen_Tool-7B-REFILL-TEST.stl”</strong></p><p>Due to the necessarily snug fit of some parts, it would be a good idea to calibrate flow prior to printing this, unless you are familiar with the filament being used, and know what flow to use. &nbsp;<strong>If you want to use the magnet, please print the cap named “Pen_Tool-7A-MAGNET-CAP.stl”.</strong></p><p><strong>Assembly:</strong></p><p>Not much to this, just take the pen “refill” from the donor pen and put it in the printed pen body. &nbsp;If you use the magnet, I suggest gluing it in with superglue (Gorilla SuperGlue Clear is what I use and it works well). &nbsp;The 4mm bit was a snug fit which is necessary, but not so tight it cannot be removed by hand. &nbsp;It will help to clean up the brim and trim any flash from around the hole where the bit is held. &nbsp;I also found that cycling a bit a half dozen times in the holder helped make it a perfect fit.</p><p><strong>Other Stuff:</strong></p><p><br>You may have noticed in the pics that the slot for M2 screws is missing on my print (oops). &nbsp;It was a case of moving things around and somehow that cutout was dropped. &nbsp;I fixed that in the upload though, and really don't use M2 (or M2.5) much, so I won't miss them on my pen. &nbsp;I was able to test the pen using nuts and bolts of all the sizes, except M2.5, which I don't have, so I used the dimensions I found for M2.5 hardware online.</p><p>I spent quite a while testing fit and getting the design right, so I hope it's useful to some folks, but if there is a problem related to the model, please let me know. &nbsp; If you print one, please post a make, and if you have a question or idea on how this could be improved please post a comment. &nbsp;The STEP file is included for easy remix'in too.</p><p><strong>Updates:</strong></p><p>I again updated the hole for the thicker part of the pen refill is 4.25mm with a slight chamfer which opens it up to 4.4mm at the opening of the pen barrel. &nbsp;I found that adding the chamfer really helps to make inserting the pen refill much easier, but it still holds it tightly. &nbsp;The updated model is updated and called “Pen_Tool-7B-PEN.stl”, I also updated the STEP file included here with this change. &nbsp;The caps were also updated very slightly to fit better. &nbsp;All the current files are version 7B.</p><p>&nbsp;</p><p>&nbsp;</p><p>&nbsp;</p><p>&nbsp;</p>