Adjustable IR Sensor Chimney for Prusa i3 MK3s with MMU2s
Description
As of 2/14/2020 This thing will no longer be updated on Thingiverse.com. Over the last few years this website has not developed new features that most of us users actually care about. And the site has become unusable slow. I will continue to respond to comments on Thingiverse but all future updates will continue to live and grow on PrusaPrinters.org. https://www.prusaprinters.org/prints/21963-adjustable-ir-sensor-chimney-for-prusa-i3-mk3s-wit This is a remix of a the great work done by ad_lamy. His Pass Through tool head and motor mount has a lot of improvements for the tool head on the original Prusa i3 MK3s with the MMU2s. Kudos. This mod is specific to the IR Sensor mount also known as the Chimney. This mod uses a small metal spring to push against the Motor mount. All you have to do to adjust, tune or calibrate the IR sensor is tighten or loosen a single M3 screw. UPDATE: 2/5/2020: I Made a V2 that uses a 5 mm Diameter metal spring instead of the original Plastic spring. This has the advantage of not wearing out so quickly. I will continue to test and update later but I firmly believe this will solve most of my previous problems. 11/19/2019: I have used this thing on two printers for a couple months now. I like this design but I have noticed three problems that I think are worth sharing. 1 (Solved with V2 metal spring) The Plastic spring looses its effectiveness over time. It is under pressure and exposed to heat. So that isn't exactly a surprise. But this can be easily solved with a remix that will use a metal spring like one from the spare parts bag. I plan to implement this in the future when I have the time. 2 The tall chimney can flex too much in my opinion. The pressure from the PTFE tube as it moves along the X axis can cause the chimney to flex a few microns. The best/most reliable way to solve this would be with a firmware update. Move the Carriage into the middle of the X before loading filament to the nozzle. That way the tension from the Bowden tube is always the same. This could also be helped with other materials that don't flex as much as PETG. 3 TPU and Flexible filaments are still a problem. They just flex too much so the arm doesn't move as far. Granted this design allows you fine tune for these filaments but then you need to re tune when you switch back to other filaments.
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