<h3>TL;DR</h3>
<p>I need a complete list of fasteners (bolts, nuts and washers) for the <em>Sintron Kossel</em>.</p>
<hr />
<p>Has anyone bought this kit, and knows the answer, or knows where this is documented?</p>
<p>A complete list would be great, but in particular, I need the dimensions (M2.5/3/4/5? and length) and quantity of the bolts (and nuts) which:</p>
<ul>
<li>fasten the PCB mounted mechanical switches to the PLA rectangular end stop spacers/holders, and;</li>
<li>fasten the PCB mounted mechanical switches and the PLA rectangular end stop spacers/holders to the extruded 2020 aluminium.</li>
</ul>
<p>I have:</p>
<ul>
<li>Searched the web, but to no avail;</li>
<li>Read the <a href="http://www.ebay.co.uk/itm/Sintron-3D-Printer-Kossel-Mini-Full-Set-w-Auto-level-for-RepRap-Rostock-Delta-/181845082062" rel="nofollow noreferrer">product page</a>, which states only &quot;screws and nuts provided&quot;;</li>
<li>Contacted <a href="http://www.ebay.co.uk/usr/sintron_tech_usa" rel="nofollow noreferrer">Sintron</a>, but not had an answer;</li>
<li>Obtained the <a href="https://www.dropbox.com/s/iifhhmistuwfja1/Kossel%20mini%20instrution%20by%20sintron%20technology_v2.pdf?dl=0" rel="nofollow noreferrer">Sintron build manual</a> but there is no list contained therein, nor contains details about the fasteners relating to the endstops, and;</li>
<li>Obtained the <a href="http://www.robotdigg.com/upload/pdf/2a823cc8a8dcff9da99cce92710cc745.pdf" rel="nofollow noreferrer">Blomker manual</a>, from which the Sintron manual is copied, but that also has no list (as well as not being relevant with respect to the endstops).</li>
</ul>
<p><strong>Note that I am only interested in the fasteners <em>specifically for the Sintron Kossel</em> and not the Kossel in general.</strong> The Sintron uses the PCB mounted mechanical switches (with four holes), and not the simple barebones mechanical switches (with two holes), and uses 2020 aluminium<sup>1</sup>, not 1515 OpenBeam:</p>
<p><a href="https://i.stack.imgur.com/Lr1BU.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Lr1BU.png" alt="Endstops and PCB mounted mechanical switches for the Sintron Kossel" /></a></p>
<p>Why? Because I purchased only the 3D printed parts from Sintron, and I am sourcing the rest of the parts cheaply, either locally or from Chinese suppliers on eBay.</p>
<hr />
<p><sup>1</sup> In my particular case, there is an additional complication. The profile of the non-standard/non-&quot;European&quot; 2020 extrusion that I am using, does <em>not</em> take T-Nuts, only M5 hexagonal nuts (it is unbelievably difficult to find the standard 2020 extrusion in Bangkok). Combine that with the fact that the Sintron kit uses only M3 nuts and <em>not</em> M5 (I only discovered this <em>after</em> purchasing the printed parts kit (see the email from Sintron, in my answer below) - not through lack of research, but because there <em>is</em> no available list of fasteners), then I have the problem of finding a nut to use (see <a href="https://engineering.stackexchange.com/questions/15628/fat-hexagonal-m3-nuts-with-outer-diameter-greater-than-6-mm">Fat hexagonal M3 nuts, with outer diameter greater than 6 mm</a>).</p>
<p>Here is a photo</p>
<p><a href="https://i.stack.imgur.com/UgSHu.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/UgSHu.jpg" alt="Four pieces of 2020 Aluminium extrusion" /></a></p>

[{'answer_id': 4174, 'author': 'markshancock', 'author_id': 6417, 'author_profile': 'https://3dprinting.stackexchange.com/users/6417', 'pm_score': 2, 'selected': False, 'text': '<p>I found two lists for the Kossel mini (the documents you referenced are for a mini, so that is what I am assuming you got).  One as a <a href="https://docs.google.com/spreadsheets/d/1s_ekMab3iavE6ohXIHZImjlCRGyXr9UWbBqC8XOGF_M/pub?output=html" rel="nofollow noreferrer">Google Doc</a> and one as an <a href="http://www.tridprinting.com/BOM/Kossel-Mini/" rel="nofollow noreferrer">order sheet</a> </p>\n\n<p>Both seem to list all the fasteners.</p>\n\n<p>Here is a Sintron mini <a href="https://www.aliexpress.com/store/product/SINTRON-Kossel-Mini-Prime-Line-Roller-Carriage-Wheel-696ZZ-Bearing-linear-rail-MGN12/114769_32427917085.html" rel="nofollow noreferrer">carriage assembly</a> and it lists the hardware included</p>\n\n<p>I found an ebay listing for the Sintron 2020 Rails.  The recommended screws are M3x20mm and here is the infor on the required t-nuts.<a href="https://i.stack.imgur.com/Hjohn.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Hjohn.png" alt="enter image description here"></a></p>\n\n<p>Happy building.</p>\n'}, {'answer_id': 4176, 'author': 'Greenonline', 'author_id': 4762, 'author_profile': 'https://3dprinting.stackexchange.com/users/4762', 'pm_score': 3, 'selected': True, 'text': '<p>After examining the guide (<a href="https://gr33nonline.files.wordpress.com/2017/05/kossel-mini-instrution-by-sintron-technology_v2.pdf" rel="nofollow noreferrer">Kossel mini instrution by sintron technology_v2</a>) and the printed parts kit, I came up with an 99.9% complete parts list. The lists relating to the effector and autoprobe mount maybe slightly incorrect:</p>\n\n<pre><code>##Parts List\n\n###Listed by Printer part/section:\n\n####Fasteners\n\n#####BOTTOM VERTEX (QUANTITY = 3)\n\nFor each:\n10 x M3 x 8 mm\n10 x M3 nut (T-nut)\n\n#####TOP VERTEX (QUANTITY = 3)\n\nFor each:\n5 x M3 x 8 mm\n5 x M3 nut (T-nut)\n\n1 x M3 x 35 mm\n1 x M3 nut\n1 x M3 washer\n\n\n#####IDLERS (QUANTITY = 3)\n\nFor each:\n1x M3 x 25 mm\n4x M3 Washers\n1 x M3 Nut\n2x F623ZZ\n\n#####MOTORS (QUANTITY = 3)\n\nFor each:\n2 x grub\n4 x M3 x 8 mm\n1 x 16T/20T GT2 pulley\n\n#####EFFECTOR\n\n6 x M3 nyloc nuts\n6 x M3 x 25 mm\n\n4 (5?) x M3 x 16 mm &lt;&lt;==, or\n2 (3?) x M3 x 16 mm &lt;&lt;==\n2 x M3 x 20 mm &lt;&lt;== For the auto probe, if mounting the autoprobe directly on to a collar, above the hotend, and not on to the flange on the Sintron PLA collar\n\n4 (5?) x M3 nuts &lt;&lt;==\n\n2 x M3 x 8 mm &lt;&lt;== fan mounted to Sintron PLA collar\n2 x M3 nuts &lt;&lt;==\n\n1 x PC4-M6\n\nNote: Some additional bolts are required for the mounting of the hotend. It is unclear what these are. See link.\n\n#####VERTICAL CARRIAGES (QUANTITY = 3)\n\nFor each:\n2 x M3 x 20 mm\n\n#####ROLLER CARRIAGES (QUANTITY = 3)\n\nFor each:\n2 x M3 x 10 mm\n1 x M3 x 25 mm\n3 x M3 nuts\n3 x M6 x 25 mm\n3 x M6 nut    \n2 x M6 washer (optional)\n\n#####ENDSTOPS (QUANTITY = 3)\n\nFor each:\n1 x M3 x 8 mm &lt;&lt;==\n1 x M3 nut (T-nut)\n3 x M3 x 8 mm &lt;&lt;==\n3 x M3 nut\n\n#####SPOOL\n\n6 x 625-2RS Bearing (or 625zz)\n5 x M5 x 20 mm\n1 x M5 x 25 mm\n6 x M5 nut\n6 x M5 washer\n(or 7 x M5 washer – there is a discrepancy between the kit (7) and the manual (6))\n3 x M3 x 8 mm ?\n3 x M3 nut (T-nut)\n\n#####EXTRUDER\n\n1 x M3 x 40 mm\n1 x M3 x 8 mm\n1 x M3 x ?? mm &lt;&lt;==\n2 x M3 nut (T-nut)\n\n1 x PC4-01\n\n#####AUTOPROBE\n\nNote: This is optional\n\n2 x M2.5 x 12 mm\n1 x M2.5 x 12 mm\n2 x M3 x 8 mm &lt;&lt;==  If mounting the autoprobe on to the flange of the Sintron PLA collar (if mounting directly on to a collar, above the hotend, then these are not required, and 2 x M3 x 20 mm replace 2 x M3 x 16 mm on the effector)\n2 x M3 nuts &lt;&lt;==  If mounting the autoprobe on to the flange of the Sintron PLA collar (if mounting directly on to a collar, above the hotend, then these are not required)\n\nSafety Pin 2.5 mm\nSpring 23.5mm\n\nTerminal Block\n1.5mm Allen key\n\nNote: Some additional bolts are required for the mounting of the autoprobe, as well as the hotend. It is unclear what these are.\n\n#####GLASS BED\n\n3 x M3 x 8 mm ?\n1 x M3 x 20 mm\n4 x M3 nut (T-nut)\n\n#####RAMPS\n\nNote: This is optional, as mounting on the top will interfere with the spool\n\n2 x M3 x 35 mm\n2 x M3 nuts\n2 x M3 nuts (T-nut)\n\n###Total Parts:\n\n####Fasteners\n\n#####BOLTS\n\nSize, Length, Quantity\nM3, 25, (1×3)+(6)+(1×3) = 3+6+3 = 12\nM3, 8, (10×3)+(5×3)+(4×3)+(4x3)+(3)+(1)+(2)+(3) = 30+15+12+12+3+1+2+3 = 78\nM3, 16, 5\nM3, 20, (2×3)+(1)+(2) = 6+1+2 = 9\nM3, 10, (2×3) = 6\nM3, 35, 3\nM3, 40, 1\nM6, 25, (3×3) = 9\nM5, 20, 5\nM5, 25, 1\nM2.5, 12, 3\n\n#####GRUB SCREWS\n\nSize, Quantity\n?, (2×3) = 6\n\n#####NUTS\n\nSize, Quantity\nM5, 6\nM6, (3×3) = 9\n—\nEITHER\n\nM3, (10×3)+(5×3)+(1x3)+(1×3)+(5+2)+(3×3)+(1×3)+(3×3)+(3)+(2)+(2)+(4) = 30+15+3+7+9+3+9+3+2+2+4 = 90\n\nOR\n\nM3, (1×3) + (1×3) + (5+2) + (3×3) + (3×3) + (2) = 3+7+9+9+2 = 33\nand\nM3 T-slot nut, (10×3) + (5×3) + (1×3) + (3) + (2) + (4) = 30+15+3+3+2+4 = 57\n—\n\n#####NYLOC NUTS\n\nSize, Quantity\nM3, 6\n\n#####WASHERS\n\nSize, Quantity\nM3, (1x3)+(4×3) = 15\nM6, (2×3) = 6\nM5, 6 (or 7)\n\n####Bearings\n\nSize, Quantity\nF623zz, 6\n625-2RS, 6\nOR\n625zz, 6\n\n####Printed Parts\n\nTBD\n\n####Structural\n\n3 x 2020 x  750/600 mm\n9 x 2020 x 360/240 mm\n\n####Electronics\n\n1 x Arduino Mega 2560\n1 x RAMPS 1.4\n5 x Stepper drivers\n3 x PCB mounted mechanical switch\n3 x Stepper motors\n1 x Extruder stepper\n\n####Belts\n\n3 x 16T/20T GT2 Pulley\nGT2 belt (5 meters)\n\n####Other Parts\n\nSafety Pin 2.5 mm\nSpring 23.5mm\nTerminal Block\n1.5mm Allen key\n9 x Delrin wheels\n9 x 696zz bearings\n\n1 x PC4-M6\n1 x PC4-01\n\n###Uncertainties\n\nThe fasteners required for the following parts is, as yet, unclear\n\nEffector/Hotend mount\nAutoprobe mount\nAdditional Extruder holder screwpoint\n\n###Assumptions\n\nHotbed frame mounts (assumed to be M3 x 8 mm)\nSpool frame mounts (assumed to be M3 x 8 mm)\nEndstops (four M3 x 8 mm are used, not just one)\n</code></pre>\n\n<p>See also <a href="https://gr33nonline.wordpress.com/2017/06/01/kossel-sintron-parts-list/" rel="nofollow noreferrer">Kossel - Sintron parts list</a>.</p>\n\n<hr>\n\n<p>I have a <em>partial</em> answer from the suppliers:</p>\n\n<blockquote>\n  <p>Hi </p>\n  \n  <p>Good Day !</p>\n  \n  <p>thanks for your contact.</p>\n  \n  <p>we use M3 bolts + T-nuts .</p>\n  \n  <p>i suppose the problem is , you don\'t have T-nuts , right ?</p>\n  \n  <p>T-nuts is used for 2020 extrusion.</p>\n  \n  <p>with warm regards.</p>\n  \n  <p>james</p>\n</blockquote>\n\n<p>I replied for a clarification of the length required:</p>\n\n<blockquote>\n  <p>Many thanks for the reply.</p>\n  \n  <p>I have two types of 2020 extrusion, with differing profiles: one that\n  takes T-Nuts, and; one that takes regular hexagonal M5 nuts.</p>\n  \n  <p>For the T-nut extrusion I have both M3 and M5 T-nuts.</p>\n  \n  <p>However, the second type of 2020 extrusion takes regular M5 nuts.\n  Regular M3 nuts will not stay in place, unless I can find some M3 nuts\n  with a larger outer diameter, greater than 7 mm.</p>\n  \n  <p>With respect to the M3 bolts, what are the lengths required? Are two\n  lengths used? One length to secure the endstop switch and holder to\n  the 2020 extrusion, and then another length to secure the remaining\n  three holes? Looking at the diagram in your build guide, it seems as\n  if only one bolt is used to secure the endstop switch and holder to\n  the frame, is that correct? Are any other bolts used to secure the PCB\n  mounted switch the the endstop holders.</p>\n  \n  <p>I thank you in advance.</p>\n  \n  <p>Best regards</p>\n</blockquote>\n\n<p>I followed this up with a second email</p>\n\n<blockquote>\n  <p>Hi again James,</p>\n  \n  <p>Following on from my previous reply.</p>\n  \n  <p>Firstly, I have found that flanged M3 nuts will work perfectly, in the\n  extrusion that will not accept T-Nuts.</p>\n  \n  <p>Secondly, what I really am looking for is a list of the lengths (and\n  dimensions) of the bolts used throughout the Sintron build. In\n  particular the endstop bolts. Rather than having to iteratively deduce\n  each bolt, a list of the bolts used would be very handy.</p>\n  \n  <p>I thank you again in advance for your kind consideration.</p>\n  \n  <p>Best regards,</p>\n</blockquote>\n\n<p>I received a second reply from Sintron</p>\n\n<blockquote>\n  <p>Hello Friend.</p>\n  \n  <p>for endstop . it\'s M3*8mm . </p>\n  \n  <p>i am collecting the list of them for you soon.</p>\n  \n  <p>thanks.</p>\n  \n  <p>james</p>\n</blockquote>\n\n<hr>\n'}, {'answer_id': 4178, 'author': 'markshancock', 'author_id': 6417, 'author_profile': 'https://3dprinting.stackexchange.com/users/6417', 'pm_score': 2, 'selected': False, 'text': '<p>For the M3 t-nuts, could you use this <a href="https://www.thingiverse.com/thing:1573410" rel="nofollow noreferrer">printed solution</a>.\nYou are just attaching a PCB; so, it you wouldn\'t need that much strength.</p>\n\n<p>Another excuse to use your 3D printer. ;)</p>\n'}]
['https://3dprinting.stackexchange.com/questions/4173', 'https://3dprinting.stackexchange.com', 'https://3dprinting.stackexchange.com/users/4762/']