A modular rack holder for installation on @3dprintingnerd filament rack. Print and place the modular parts directly onto the beam. Print anything directly from the rack, where your filaments are at. Reduce the need to reposition module parts, because spools can be run anywhere along modules.

Design considerations:

1) Modularity: Install as many modules as you need, and whatever length you need. Top off the sides with smaller modules as necessary, or for smaller sized spools.

2) Adaptability: Slide the modules around the shaft, so that you can accomodate the modules to where your filament sits. Alternatively your filament can be positioned anywhere along the modules (on one -80 module, or resting in-between two). Don't be constrained by dividers which partition your space. 

3) Ease of usage/installation: Don't waste your time finding bearings or drilling holes in your shelf; just print this and you will get a working spool right away! The ramp rangle accounts for most standard spool diameters (20cm), such that they can be slid on. You don't have to reposition filaments to use, the filament guide solves your problem. Sometimes, you may have accidentally forgotten to feed the filament through the guide before inserting into the hotend, the modularity of the guide removes the dependency earlier mentioned. You can push in the guide after feeding your filament into the hot end.

To use, print the ramp_x_grooved for the front bar, while the ramp_x for the back bar. For the standard sized spool (1kg), choose x = 80(cm). The other options gives modularity.

The grooves are for slotting in the filament locking pin which is a filament guide, so that the filament does not need to be repositioned directly above the printer. The fact the pin can be removed means that you do not need to thread the filament through it. (Just feed your filament into your printer, then lock in the pin after, just below the spool. This keeps the spool in position from moving around. Some scaling may be needed for a tight fit of the filament locking pin.

Note: The picture shows the modular components printed for 2020 extrusions (20mm gap), but the files have a gap of 18mm.

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