Sunday, 11 August 2013

Mini Maker Faire - Manchester..

Mini Maker Faire in Manchester was fantastic and we met Nophead as well! We made rocket badges, tunes with the scientists and potato cannons!

We (my youngest son) helped testing Waterbear and debugging (well a bit) the script tool for Raspberry PI Minecraft. Minecraft Steve was determined to stay with his feet firmly on the ground...! Rather than 50m up as programmed and he can walk on water!.

Mini Maker Faire - Manchester
We saw one of Chris (aka Nophead's) Mendel 90 machines and some of the fantastic prints he has been making together with a few other machines on his stand. There were cute little robots being printed at the time. Most interestingly there was some printing on IKEA mirror glass. which was about 2mm thick. We are going to try this soon on Huxley #710.

With many mirror glass tiles we can speed up printing considerably, not having to wait until the bed cools! The mirror backing may even reflect heat back on to the part which might help print quality. I have also always been bothered by the sharp edges on the borosilicate glass. Although it is sized perfectly for Huxley #710 and the tiles may need some trimming to fit correctly.

Following from the report on ultra fine particles (UFP's) in the phys.org article posted on the RepRap blog - Wednesday, July 24, 2013.  We are in the process of venting Huxley #710 outside with a rudimentary heat exchanger (long plastic pipe) to recover waste heat from the ventilated air. Temperature measurements indicate the electronics are running in an ambient of 31C with a room temperature of 21C and an exhaust rate of 85m³/hr - 23l/s. The box that Huxley #710 is located in is 40L so a complete removal of the volume of the box occurs approximately every 2 seconds. As the fan on the hot end is blowing air around which will be carrying the UFP's This seemed the most sensible approach to the problem. The plastic tube allows a small amount of heat recovery ;-) although this is really a mechanism to get to the window as the room has no other natural outlet. The window vent is now being re-tasked with a printed convertor to enable us to print in the winter without having to have the window open!

At the moment the chamber consists of a cardboard box with the front removed to allow parts to be retrieved and air to enter. A hood is created with around a third of the lid to create something that resembles a fume cupboard. The main concern was the ventilation rate would be insufficient to keep the unit cool, given the amount of energy being pumped into the box. The measurements seem to indicate we have it about right. The next step is to obtain a large plastic box as we like to see our printer running. A little more room around the printer would be good to allow easier access to the machine for cleaning and service.

Huxley #710 Ventilation Fan



Mini Maker Faire - Manchester

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