{"id":17,"date":"2015-06-16T16:45:00","date_gmt":"2015-06-16T15:45:00","guid":{"rendered":""},"modified":"2023-01-07T19:17:07","modified_gmt":"2023-01-07T19:17:07","slug":"mini-kossel-build-part-4-spool-holder","status":"publish","type":"post","link":"https:\/\/blog.hslracing.com\/3dprinters\/2015\/06\/mini-kossel-build-part-4-spool-holder.html","title":{"rendered":"Mini Kossel Build Part 4 – Spool Holder and End Stops"},"content":{"rendered":"

My new E3D hot end clone turned up the other day for my\u00a0Mini Kossel<\/a>, this cost \u00a37.49 ($11.60) with free P&P from ebay<\/a> seller digital_store_2014<\/a>.<\/p>\n

\"\"<\/a><\/div>\n

I will replace the thermistor with a ATC Semitec 104GT-2 so that it is a known quantity, rather than the complete unknown that came with the hot end.<\/p>\n

Based on the issues I had in the early days with my Prusa I3<\/a> printer and having to manually turn a spool of filament, I decided to get ahead of the game this time and print a spool holder.<\/p>\n

I particularly like the look of this minimalist spool mount and guide on Thingiverse<\/a><\/p>\n

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As there are really only 2 different items to print, I need 3 of one of them and they are all pretty small, I decided to print them all at once.<\/p>\n

\"\"<\/a><\/div>\n

In total this used 5767mm of filament for a cost of \u00a30.216.<\/p>\n

To make them up required 6 x 625 bearings, 5 x M5x20mm screws, 3 x M5x10mm screws, 1 x M5x30mm screw, 6 x M5 nuts, 3 x M5 T Nuts and 11 x M5 washers.<\/p>\n

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The 625 bearings were \u00a31.61 ($2.50) for 10 from\u00a0ebay<\/a>\u00a0seller\u00a0warm_tech<\/a>, the screws, nuts and washers were all from Orbital fasteners, and the T-nuts were $7.50 (\u00a34.85) for 100 from\u00a0robotdigg<\/a>.<\/p>\n

This makes the total cost (6 x 0.161) + (5 x 0.0484) + (3 x 0.0394) + 0.0697 + (6 x 0.0041) + (3 x 0.0485) + (11 x 0.0041) = \u00a31.61 ($2.50).<\/p>\n

These were then installed on the top of the frame and adjusted to fit one of my spools of filament.<\/p>\n

\"\"<\/a><\/div>\n

I then relocated the extruder stepper motor and fitted the hot end and a length of 4mm OD, 2mm ID PTFE tubing between the push fit connector on the extruder and the one on the hot end.<\/p>\n

\"\"<\/a><\/div>\n

I am still deciding on how thick an acrylic printing surface I want to use, I will either settle on 10mm, or 5mm and a 2mm aluminium sheet underneath it for additional rigidity.<\/p>\n

5mm will be cheaper at half the price, but also half the rigidity.<\/p>\n

I have designed some end stops for use with my hall effect sensors and magnets in Sketchup.<\/p>\n

\"\"<\/a><\/div>\n

For some reason Slicer did not like the countersinks I had put in the holes, it was convinced that there was a hole in the solid, so I decided to print them without and manually countersink them afterwards.<\/p>\n

The slot for the hall effect sensor curves upwards towards the rear to help the pins exit the hole.<\/p>\n

Here are the end stops hot off the printer.<\/p>\n

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The 3 end stops used 1572mm of filament for a total cost of \u00a30.06.<\/p>\n

Here \u00a0is one with the hall effect sensor installed and held in place with some blue tac.<\/p>\n

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I have pre-insulated the pins with some electrical tape to prevent unwanted contact of the neighbouring pins.<\/p>\n

View from underneath.<\/p>\n

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Here are all three after I removed the sensors and then manually countersunk for the M4 screws with an 8.5mm drill and then re-assembled.<\/p>\n

\"\"<\/a><\/div>\n

I actually turned the drill by hand rather than under power on my mini mill to give me more control of how much material was being removed.<\/p>\n

I have two sets of very sharp, precision ground HSS metric drills, from Chronos<\/a> in 0.1mm increments covering 1-6mm and 6-10mm respectively. I use these whenever I require a very sharp or accurate drill, most of the rest of the time I use a more generic set of drills.<\/p>\n

The hall effect sensors were $4.00 (\u00a32.58) for 10 from\u00a0ebay<\/a>\u00a0seller gc_supermarket<\/a>, the M4 T-nuts were $7.50 (\u00a34.85) for 100 from robotdigg<\/a>, and the countersunk M4 screws actually came with hinges I bought for my laser cutter where I used some slightly longer screws instead, so these were effectively free.<\/p>\n

The total cost for the completed endstops is therefore 0.06 + (3 x 0.258) + (3 x 0.0485) = \u00a30.882 ($1.35).<\/p>\n

Here are some coils of wire I made up for the endstops, they are each about a metre long and are made from 3 cores of a 50m reel of 6 core alarm cable I bought from Wickes<\/a> for \u00a312.49 ($19.35) back when I was building my\u00a0Prusa I3<\/a>, so about \u00a30.25 each.<\/p>\n

\"\"<\/a><\/div>\n

Mixing up the various cores allows each cable to either be the same or different depending on what you require at the time.<\/p>\n

I tend to leave the outer protective sleeve on for the 4 core motor wires, but twist any signal wires to help avoid any cross talk interference, should the signal wires need to run together with the motor wires.<\/p>\n","protected":false},"excerpt":{"rendered":"

My new E3D hot end clone turned up the other day for my\u00a0Mini Kossel, this cost \u00a37.49 ($11.60) with free P&P from ebay seller digital_store_2014. I will replace the thermistor with a ATC Semitec 104GT-2 so that it is a known quantity, rather than the complete unknown that came with the hot end. Based on…<\/p>\n","protected":false},"author":1,"featured_media":142,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[2],"class_list":["post-17","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorised","tag-mini-kossel"],"_links":{"self":[{"href":"https:\/\/blog.hslracing.com\/3dprinters\/wp-json\/wp\/v2\/posts\/17","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.hslracing.com\/3dprinters\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.hslracing.com\/3dprinters\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.hslracing.com\/3dprinters\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.hslracing.com\/3dprinters\/wp-json\/wp\/v2\/comments?post=17"}],"version-history":[{"count":4,"href":"https:\/\/blog.hslracing.com\/3dprinters\/wp-json\/wp\/v2\/posts\/17\/revisions"}],"predecessor-version":[{"id":277,"href":"https:\/\/blog.hslracing.com\/3dprinters\/wp-json\/wp\/v2\/posts\/17\/revisions\/277"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blog.hslracing.com\/3dprinters\/wp-json\/wp\/v2\/media\/142"}],"wp:attachment":[{"href":"https:\/\/blog.hslracing.com\/3dprinters\/wp-json\/wp\/v2\/media?parent=17"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.hslracing.com\/3dprinters\/wp-json\/wp\/v2\/categories?post=17"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.hslracing.com\/3dprinters\/wp-json\/wp\/v2\/tags?post=17"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}