A method for neatly stowing the lines on a skydiving parachute

Looking at the way some freshly licenced (and some older) jumpers struggle with making neat line stows, I figured I’d document the method I’ve been using to stow my lines. Here goes: A method for neatly stowing lines These instructions are for stowing a bight of lines on the right-hand side of the bag; for… Continue reading A method for neatly stowing the lines on a skydiving parachute

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Making a composite material from ABS slurry

Since I do a fair bit of 3D-printing, there’s always plenty of scrap ABS available. Some of the scraps go into the acetone / ABS slurry that I use to coat the build platform before each print, but there’s still plenty more to go around. So, this got me thinking: “If I make something out… Continue reading Making a composite material from ABS slurry

Nginx as origin for S3 with authentication, with CDN on top

We recently had a small problem with our content delivery system. The setup is as follows: – AWS S3 bucket that requires authentication – EC2 instance, running Nginx with ngx_aws_auth – ELB load balancer in front of the EC2 instance – CDN configured to use the ELB as the origin The problem was that the… Continue reading Nginx as origin for S3 with authentication, with CDN on top

Nginx: Reject request if header is not present

It was surprisingly difficult to find a full working example of this, so here’s my take on “How to make Nginx require that a certain header is present with a certain value in the incoming request”: nginx.conf: http { map $http_x_mycustomheader $is_mycustomheader_not_ok { default “1”; MyApprovedValue “0”; } … } mysite.conf: server { … location… Continue reading Nginx: Reject request if header is not present

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Obi-Wan Kenobi’s flashlightsaber

I happened to find this 3D-printable model of Obi-Wan Kenobi’s lightsaber, so I decided to see if me and my 3D-printer were up to the task. There’s also an article about designing the lightsaber model in the Ultimaker blog.