Kossel Linear Plus Part Cooling duct and 85mm LED ring

thingiverse

I wanted to add lighting to my Kossel so I could monitor overnight prints without leaving lights on all night. The Neopixel range of addressable strips and rings seemed perfect, needing just a single data line for RGB control and a 5-volt supply. At the same time, I wanted to improve the mediocre fan duct on the Kossel. There were plenty of designs online that looked good, but some had basic mounting systems that might bend or droop in use. This gave me the push to try designing something myself. So here's my design. I should note that although this was drawn from scratch in Fusion 360, I took inspiration from several current designs, mainly listed in the remix https://www.thingiverse.com/thing:3348546 The duct is a 3/4 ring design, leaving enough space for the Z probe to be fitted and removed as needed. It uses an "Air Knife" concept and, given the limited size of the stock 5010 centrifugal fan, produces a reasonable draft at the nozzle tip. This can be felt with your finger or tested with a shallow bowl of water on the build plate. The LED ring support is built into the fan duct and forms part of its structural strength. A pair of supports clip over the effector baseplate, while the rear is secured by the original two M2 cap head screws under the duct flange. The ring is designed to accept Neopixel 85mm outside diameter 24-element rings. It's not recommended to try running these lighting devices directly from the controllers' pins due to high current draw. I used an adjustable buck converter, which also needed a housing, so I included it in this project. The housing can be used with or without ventilation, depending on how much power you plan to draw through it, or it can be completely open-topped and held together with shorter M3 screws to secure the circuit board. Parts list below: Adafruit NeoPixel circle ring clone, 24-addressable WS2812-5050 RGB LEDs, 85mm diameter https://www.ebay.co.uk/itm/193106990733?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649 Addressable LED connection cables (x4) https://www.amazon.co.uk/gp/product/B07L1NXHDK/ref=ppx_yo_dt_b_asin_title_o06_s00?ie=UTF8&psc=1 1000mm stepper motor cable with JST connector (to cannibalize for wiring the LED to the SKR 1.3 servo port) https://www.amazon.co.uk/gp/product/B071R7SBPL/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 Buck converter, adjustable https://www.amazon.co.uk/Valefod-Voltage-Regulator-1-5-35V-Converter-2x-LM2596-w-LED/dp/B07VMLMLFN/ref=sr_1_18?dchild=1&keywords=adjustable+buck+converter&qid=1591480025&s=industrial&sr=1-18 M3 x 6mm countersunk screws (buck converter case mounting) [2 off] M3 x 16mm or 20mm screws (buck converter lid mount) [4 off] M3 x 4mm screws (circuit board retainer if no lid fitted) [4 off] M2 x 4mm screws (NeoPixel ring securing to effector mounting ring) [4 off] Various bootlace ferrules and heatshrink consumables for termination, along with some flat twin core wire for connecting the buck converter to a 12-volt supply. Update: 07June2020. I've uploaded a zip file of my complete Marlin config for the Kossel LP, including the recently added NeoPixel LED firmware. It uses the servo port on the SKR 1.3.