Getting TPU to work on the K2 Plus took quite a bit of finagling. Here's what finally worked for me: SETTINGS & CONFIGURATION Start with the special TPU settings available on YouTube. Search for "k2 plus tpu" and follow these videos to the letter: https://www.youtube.com/watch?v=aMTfheNcf_U https://www.youtube.com/watch?v=slArKGd6pDk https://www.youtube.com/watch?v=CqMtjV8Wumk OVERTURE 95A TPU SETTINGS Filament: TPU / Overture Pressure Advance: 0.04 Max Volumetric Speed: 3 mm3/s Nozzle Temperature: First Layer 220°C / Other Layers 215°C Bed Temperature: 40°C (Textured PEI Plate) Retraction Length: 2.0 mm Retraction Speed: 40 mm/s Retraction on Layer Change: Disabled Wipe while retracting: Disabled Z Hop when retracting: 0.4 mm Fan Speeds: Side Fan 70% / Back Fan 60% TOP-MOUNT SPOOL SETUP I'm running a custom top-mount system that bypasses the CFS: Bearing spool holder: https://www.crealitycloud.com/model-detail/rolling-bearing-spool-holder-k2-plus CFS rack/riser: I used a 20x20 aluminum profile t-slot bar. This model looks similar: https://www.crealitycloud.com/model-detail/creality-k2plus-cfs-rack-updated I bent the external spool bar's filament guide and attached it to the top riser EXTRUDER MODIFICATIONS Spring replacement - This was crucial. Swap the stock spring for a softer one with these specs: ID 4.8mm, OD 6mm, Length 15mm. I bought a set of 10 off Amazon, though some people have even used springs from broken pens. Tension adjustment - Don't overtighten the extruder head filament pusher. This is a subtle but important detail that most guides don't mention. Spacer mod - Even with everything above, I still needed this spacer: Model: https://www.crealitycloud.com/model-detail/k2-plus-extruder-tensioner-tpu-printing Tutorial: https://www.youtube.com/watch?v=H1NHY4VfS5M RESULTS The shoes came out awesome! I had minor stringing on the toe tip, which I covered with Shoe Goo—barely noticeable. Wear notes: Socks are mandatory—the infill pattern will scratch your ankles otherwise I'm using old heat-cured custom orthopedic FP insoles, which work excellently and provide nice elevation