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Important note on the files: In the \u201cOther Files\u201d section there are three sets of ZIP files with all the objects bundled by type (4 zip files by set). Two of the sets include a recycling symbol in the objects: either PLA, code 7, or PETG, code 1 (not 7!); the third, \u201cnosymbol\u201d, packs all the objects with no recycling symbol, as found in the \u201cModel Files\u201d section. You can use the Recymbol library to add your custom symbols, f.i. PETG code 7, ASA, etc.; use the objects in the Shape Gallery from PrusaSlicer as \u201cparts\u201d if you need some \u201cbackground\u201d or \u201cfiller\u201d for raised symbols.

Main features

In the \u201cOther Files\u201d section there is a PDF with detailed instructions about what is this, how to use, what to print (and/or download). Here I will list just the main features of the system, so you can decide if it suits your needs:

Three-component structure, with a central hub and two exchangeable plates (which may or may not be in several parts, see below)
Uses a screw thread 60mm in diameter, with a 45-degree trapezoidal section, chamfered, with 2 leads and a 0.1mm allowance.
52mm hole for axial mounting
Different hub diameters available for the different refill types: 102mm (MasterSpool standard), 85mm (Sunlu refills), 90mm, 92mm (eSUN refills) and 93mm (Prusament refills).
Different heights available for the different diameters, so you can fit the corresponding coil nicely. Some of the diameters have few or only just one height available, as they are diameters for few or only one manufacturer that makes only one coil weight. Use the \u201chub connector\u201d accessory to fit two or more hubs together.
Hubs have 3 dessicant pockets facing the filament (where they are needed!). You can use the usual sachets, but it may be better to use color-changing beads in little clear organza bags. The pockets have inspection holes at the bottom, that double as ziptie pass-through holes \u2014so you can also hold the ziptied coil to the hub. That\u2019s also why the pockets have a notch on their top.
6 insertion holes for the inner filament tip in the hub, facing in 2 directions (3 for each direction). This and the one-part plateless hub makes for an easier insertion.
Several plate diameters available: 198mm (MasterSpool V4 standard), 160mm and 140mm (for samples and small coils, like the RS160 and RS140 series). Other diameters, bigger and smaller, can be made.
Variants for all the different hub diameters.
Different useful hub height adjustments available.
6 filament tip channels in each plate (no need for clips!). Channels are elliptical in shape and square diamond in section (45\u00ba overhang), so the filament tip won\u2019t be forced, and the channel will be well printed.
A 5mm, high-definition brim to works well with \u201ccradle\u201d or roller-style spool holders (channel holes might need a bit of retouching). The thickness of the main section of the plate is 3.25mm in the single-piece versions and 5mm in the threadless and multipart versions.
Measuring scales for a quick view of the remaining filament, in 25% and 10% increments. If you want a precise measure it\u2019s far easier to weight just the coil, that\u2019s right\u2026 but likely you won\u2019t do that while printing.
Single-part and multipart variants, for better modularity and ability to print in small and very small printbeds. Two-part plates allow you to change the hub diameter and/or height adjustment easily just by swapping a plate cap \u2014no need to print a whole new plate.
Several different designs available: \u201clabrys\u201d or double axe, rounded hexagons or \u201chexarcles\u201d (\u201chexarcle\u201d = hexagon + circle), polar squares, teardrops, polar spiral-like lozenges or \u201cdiamonds\u201d.
Sample plates with a 20mm hub attached (in 140 and 160mm diameter only) for samples and loose coils like Lay Filaments'. These are closed by a regular same-diameter plate.
A wide range of accessories available for storage and general operation:
- Reamers to test thread allowance and cleaning your threads
- Hub caps for different uses:
  - Hygrometer caps for either rectangular or round hygrometers;
  - Desiccant caps with a grill to add even more desiccant;
  - Closing caps, be it the simple plain cap that has the regular hole, or the full cap with the hole closed, for labeling or to use as a template for your designs.
- Hub connectors to join hubs together, either for enlarging them for non-standard heights, or for better storage.
- A spacer for acorn nuts, to have a flush spool border.
Informative texts at the bottom, with the diameter, height and (in some cases) recycling symbol for the hub itself. You can use text inserts that can be printed in another color without a MMU, Palette or similar using Devin Montes\u2019 \u201cPrint On Print\u201d technique, described in the PDF.
Less than 250g of filament used for a MasterSpool compliant spool (102mm hub, -2 to -1 single piece plates) except for the \u201ccheckered flag\u201d design of 3x2 squares (~255 grams of plastic).

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