Prusa Mini rear extruder part with filament sensor

prusaprinters

<p>This remix of the Prusa mini extruder rear part with integrated filament sensor.&nbsp;</p><p>You will need parts for this to work:&nbsp;</p><ul><li>parts which are in original filament sensor for Prusa:<br><br>1x IR filament sensor<br>1x cable for filament sensor<br>1x steel ball 7 mm<br>2x magnet 10x6x2 mm<br>1x M2x8 mm<br>&nbsp;</li><li>&nbsp;parts which you need to source elsewhere:&nbsp;<br><br>2x M3x12 screw with roundhead</li></ul><p><strong>Assembly manual</strong>:&nbsp;</p><ul><li>remove support material from the print</li><li>insert steel ball<br><img class="image_resized" style="width:50%;" src="https://media.prusaprinters.org/media/prints/154526/rich_content/a631f2c7-ce8a-4126-ad2b-2008d8169eed/20220326_153011.jpg#%7B%22uuid%22%3A%22216bdb86-7414-457f-9356-cb6cb8c32c11%22%2C%22w%22%3A5664%2C%22h%22%3A4248%7D">&nbsp;</li><li>screw in lever with hole for magnet with M3x12 roundhead screw<br><img class="image_resized" style="width:50%;" src="https://media.prusaprinters.org/media/prints/154526/rich_content/f0848b17-9026-409b-94f6-b3e3b0638b3b/20220327_235552.jpg#%7B%22uuid%22%3A%221eeab785-ece2-44cd-8a54-fa8ccd5c40d2%22%2C%22w%22%3A5664%2C%22h%22%3A4248%7D"></li><li>screw in IR sensor with M2x8 screw<br><img class="image_resized" style="width:50%;" src="https://media.prusaprinters.org/media/prints/154526/rich_content/e27e0a9b-b2d3-4547-8c1e-21aea23cc30f/20220327_235816.jpg#%7B%22uuid%22%3A%22738b1e28-dfcf-4fbd-9941-dff3d956dbf5%22%2C%22w%22%3A5664%2C%22h%22%3A4248%7D"></li><li>screw in second lever with M3x12 roundhead screw<br><img class="image_resized" style="width:50%;" src="https://media.prusaprinters.org/media/prints/154526/rich_content/45317d0d-d9cf-445b-a94f-383c1ede774b/20220328_000001.jpg#%7B%22uuid%22%3A%22549ba773-bc6a-402d-9411-925419c6c928%22%2C%22w%22%3A5664%2C%22h%22%3A4248%7D"></li><li>put magnets in so they repel each other<br><img class="image_resized" style="width:50%;" src="https://media.prusaprinters.org/media/prints/154526/rich_content/f8afaec9-ec3a-4757-a83a-6b3605d4c256/20220328_000115.jpg#%7B%22uuid%22%3A%22517dbeca-407b-4c7d-871b-1d71905683de%22%2C%22w%22%3A5664%2C%22h%22%3A4248%7D"></li><li><strong>test </strong>if machanism work with piece of the filament</li><li>put cover on<br><img class="image_resized" style="width:50%;" src="https://media.prusaprinters.org/media/prints/154526/rich_content/010d14e6-23d2-45bd-ba01-6bb9e984d007/20220328_000202.jpg#%7B%22uuid%22%3A%22f07a9e6a-d367-4d3d-915c-43e428a1d0b4%22%2C%22w%22%3A5664%2C%22h%22%3A4248%7D"><br><br><strong>Hotend disassembly</strong>:</li><li>unload filament</li><li>unscrew extruder by this order → hold it so it will not fall down<br><img class="image_resized" style="width:50%;" src="https://media.prusaprinters.org/media/prints/154526/rich_content/0de37e4a-cd26-4340-8920-96525bad1bed/20220328_002512.jpg#%7B%22uuid%22%3A%222ad83403-3efb-4fe4-b675-ced990cafd7b%22%2C%22w%22%3A5664%2C%22h%22%3A4248%7D"></li><li>loosen screw which holds PTFE tube (1)</li><li>remove screw which holds extruder together (2-4)</li><li>remove M3 locknut (5)</li><li>push out bearing (6)</li><li>remove tensioning screw (7)</li><li>remove brass fitting (8) with universal wrench from Prusa Mini kit (or with other tool)<br><img class="image_resized" style="width:50%;" src="https://media.prusaprinters.org/media/prints/154526/rich_content/e1b165fd-f498-4eb0-8846-3d9c0213463f/20220328_002646.jpg#%7B%22uuid%22%3A%224d2eb9ed-f967-4250-8770-c44cdd69ff0a%22%2C%22w%22%3A5664%2C%22h%22%3A4248%7D"><br><br><strong>Hotend assembly</strong>:</li><li>replace rear extruder part with new one</li><li>go backwards in disassembly steps<br><i><strong>TIP</strong></i>: I recommend use 10 mm socket wrench for brass fitting, as it is much easier to allign it with the hole and screw it in. <strong>Be carefull not to bend short PTFE tube!</strong><br><img class="image_resized" style="width:50%;" src="https://media.prusaprinters.org/media/prints/154526/rich_content/3cfcb282-0de7-4c74-9c9c-6359ab165980/20220328_013654.jpg#%7B%22uuid%22%3A%221e808e59-5912-48f9-975c-2f53d6f11cfe%22%2C%22w%22%3A5664%2C%22h%22%3A4248%7D"><br><br>Last part is connect cable from filament sensor to Buddy board. Follow official <a href="https://help.prusa3d.com/en/guide/5-lcd-assembly-electronics_202703#203299">manual</a> for this.&nbsp;<br><i>Note</i>: I do not know if <a href="https://www.prusa3d.com/cs/produkt/ir-filament-senzor-buddy-kabel-mini/">official cable</a> will be long enough, as I used custom made one.<br><i>Note #2: </i>User <a href="https://www.prusaprinters.org/cs/social/210917-amperage/about">Amperage</a> confirmed in the comments that original cable is long enough.<br><br>I wired my non-original cable this way:<br><img class="image_resized" style="width:50%;" src="https://media.prusaprinters.org/media/prints/154526/rich_content/56d102d2-fd2f-415b-b0bb-4e6877820eeb/20220329_225928.jpg#%7B%22uuid%22%3A%226d55a3cf-ba38-4687-bb4c-48e18c87105a%22%2C%22w%22%3A5664%2C%22h%22%3A4248%7D">&nbsp;<br><img class="image_resized" style="width:50%;" src="https://media.prusaprinters.org/media/prints/154526/rich_content/d6e1740e-d386-462b-b3e2-e372b4158821/20220329_225943.jpg#%7B%22uuid%22%3A%2239a1b69e-2ab9-451e-b480-dc92cb312903%22%2C%22w%22%3A5664%2C%22h%22%3A4248%7D"></li><li><strong>push </strong>PTFE tubing (for filament) in to the rear extruder part. It should hold in on its own by friction.&nbsp;<br>&nbsp;</li></ul><p><strong>Warning!&nbsp;</strong><br>There is issue with extruder colliding with sleeve for X-axis motor. There is not enough space between my version of rear extruder part and Z-axis profile, but I can do much about it. Solution which I´m using is pull-out sleeve from the profile and leave there just cables as you can see at pictures below.&nbsp;<br>&nbsp;<br><img class="image_resized" style="width:50%;" src="https://media.prusaprinters.org/media/prints/154526/rich_content/740444bd-86cc-48e6-a29e-cf5007d4d6e1/20220329_224445.jpg#%7B%22uuid%22%3A%229b360159-d969-413c-b282-a45f118c61f8%22%2C%22w%22%3A5664%2C%22h%22%3A4248%7D"><br>&nbsp;<br><img class="image_resized" style="width:50%;" src="https://media.prusaprinters.org/media/prints/154526/rich_content/13890552-9de1-4388-aad4-4c9f07d4a932/20220329_224521.jpg#%7B%22uuid%22%3A%229618484d-2da0-4d2f-a33c-faf5847238a9%22%2C%22w%22%3A5664%2C%22h%22%3A4248%7D"><br>&nbsp;<br><img class="image_resized" style="width:75%;"><img class="image_resized" style="width:50%;" src="https://media.prusaprinters.org/media/prints/154526/rich_content/fc70cf0f-6162-4b8c-af19-81ce959dcbb2/20220329_224543.jpg#%7B%22uuid%22%3A%22cebbf3e4-767c-45a2-a972-82150b795cb5%22%2C%22w%22%3A5664%2C%22h%22%3A4248%7D"><br><br><br>I hope this will help you make this work. If you will have any question, do not hesitate to ask. &nbsp;</p>