Simplified Preston Iris Ring Holders

prusaprinters

This is a simplified version of Chromatic Pic's excellent design.  Uses a fair bit less filament so it prints faster and is economical!PRESTON RING HOLDER 8U will hold 8 preston single channel rings.  This is only printable on a Prusa MK4 or larger.PRESTON RING HOLDER 7U will hold 7 preston single channel rings.  This will fit on the bed of a Prusa Mini.PRESTON RING HOLDER 6U will hold 6 preston single channel rings.  This will also fit on the bed of a Prusa Mini.PRINT INSTRUCTIONS:Recommended to print in PETG.  0.4mm head, 0.20mm layer height is fine.  0.20mm STRUCTURAL with PrusaMK4 Input Shaping worked great.20% infill was fine, but you can go more if you'd like.