PC4M6 Adapter for the MMU2 quick PTFE Tube change system  IKEA Samla drybox
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PC4-M6 Adapter for the MMU2 quick PTFE Tube change system - IKEA Samla drybox

I only got PC4M6 fittings on hand so I merged a M6 Slot with the PC4M10 holder using PrusaSlicer Works pretty well models ...

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PC4-M6 Adapter for the MMU2 quick PTFE Tube change system - IKEA Samla drybox alternatives