Prusa MMU2 Selector with magnet and opened FINDA canal
cults3d
UPDATE 13/10/2019: I've released a new E2 version, wich addresses some issues found when unloading filament after runout (see DonKarnage comment on Sep 29, 2019). However this new version has not been tested by me. Please leave a comment if you are using it. Thank you. This version of the Prusa MK3 MMU 2.0 selector combines three interesting ideas from Thingiverse users: 1. "MMU2 Filament Selector w/ Mag FINDA Sensor fix 6mm" by TimGold (https://www.thingiverse.com/thing:3264138). Adding a small magnet under the FINDA ball chamber, to help keep the ball down and to prevent it from remaining lifted up when the tip of the filament ends with a string or there are some debris left in the chamber. When the ball stays up, the MMU detects an incorrect filament length, thus causing problems during loading and unloading. "Prusa MMU2 selector mod" by jltx (https://www.thingiverse.com/thing:3199061). Partially opening the FINDA canal and chamber, to monitor filament loading, observe the ball status, set the FINDA height visually and extract debris mid-print. "PRUSA MMU2 Selector Improvements" by kmccon (https://www.thingiverse.com/thing:3157550). Chamfers and fillets were added in a few places to smoothen filament path. Moreover, I've made some little modifications: - Smoother holes and passages (some more fillets and chamfers) - Simpler insert for the magnet. Instead of inserting it from bottom, I opted to push it from one side, reducing the hole needed. I'm using a 6x2 mm round neodymium magnet (real thickness is 1,73mm, I bought these: https://www.aliexpress.com/item/6x2mm-round-Neodymium-magnet-N50-N52/32872232504.html), but you can easily change it using Fusion 360 sources included. You will need a longer M3 bolt to hold the POM nut. The original is 10mm, but you will need at least a 15mm-16mm.
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