{"id":10,"date":"2020-03-09T22:20:00","date_gmt":"2020-03-09T22:20:00","guid":{"rendered":""},"modified":"2023-01-07T19:04:17","modified_gmt":"2023-01-07T19:04:17","slug":"mini-kossel-build-part-5-psu-holder","status":"publish","type":"post","link":"https:\/\/blog.hslracing.com\/3dprinters\/2020\/03\/mini-kossel-build-part-5-psu-holder.html","title":{"rendered":"Mini Kossel Build Part 5 – PSU Holder"},"content":{"rendered":"

I actually made these parts back in October 2015, but simply forgot to post an update.<\/p>\n

I wanted to make use of one of my many salvaged laptop power supplies to run the Mini Kossel<\/a>, and since I intend to try using a sanded acrylic print bed, I won’t need 10A to heat it, as such I only need enough power to run the extruder and the motors.<\/p>\n

I have decided to use a 24V laptop PSU to power the extruder and motors and then a DC-DC Buck converter to supply the 5V for the Sangionololu internal electronics.<\/p>\n

Trying to lose 19V as heat through a 7805<\/a> voltage regulator seemed somewhat excessive, whereas the Buck converter should only lose minimal heat as it is around 95% efficient.<\/p>\n

The DC-DC Buck converter at \u00a30.87, is more expensive than \u00a30.10 for a 7805<\/a>, however the power savings will make up the difference in no time.<\/p>\n

In order to fit the DC-DC Buck converter, you also need to skip installing the C5 (0.33uF) and C6 (0.1uF) capacitors, I fitted a 3 pin header in place of the 7805<\/a> itself.<\/p>\n

This is the DC-DC Buck converter attached to the back of the Sanguinololu <\/a>board.<\/p>\n

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

You will also note that I do not bother installing any of the FTDI related parts IC100, J1, C7, C8, C11, C15 or C16, as I prefer to program the chip via the ICSP interface and communicate with it via a bluetooth module on the serial pins.<\/p>\n

Here is the top showing how it is wired in place of the 7805 <\/a>voltage regulator.<\/p>\n

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

I am also using a 24V cartridge heater<\/p>\n

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

I needed a bracket to hold the laptop PSU, so I designed one in Sketchup and then printed it.<\/p>\n

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

Here it is attached to the frame with the PSU held in place.<\/p>\n

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

Here you can see the socket for attaching the mains cable between the two lengths of 2020 extrusion.<\/p>\n

\"\"<\/a><\/div>\n","protected":false},"excerpt":{"rendered":"

I actually made these parts back in October 2015, but simply forgot to post an update. I wanted to make use of one of my many salvaged laptop power supplies to run the Mini Kossel, and since I intend to try using a sanded acrylic print bed, I won’t need 10A to heat it, as…<\/p>\n","protected":false},"author":1,"featured_media":101,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[2],"class_list":["post-10","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\/10","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=10"}],"version-history":[{"count":4,"href":"https:\/\/blog.hslracing.com\/3dprinters\/wp-json\/wp\/v2\/posts\/10\/revisions"}],"predecessor-version":[{"id":265,"href":"https:\/\/blog.hslracing.com\/3dprinters\/wp-json\/wp\/v2\/posts\/10\/revisions\/265"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blog.hslracing.com\/3dprinters\/wp-json\/wp\/v2\/media\/101"}],"wp:attachment":[{"href":"https:\/\/blog.hslracing.com\/3dprinters\/wp-json\/wp\/v2\/media?parent=10"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.hslracing.com\/3dprinters\/wp-json\/wp\/v2\/categories?post=10"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.hslracing.com\/3dprinters\/wp-json\/wp\/v2\/tags?post=10"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}