Stacker for Wire Spool Holders

Support legs for stacking specific racks of small-gauge hook-up wire spools for electronics.

I really like the "Modular Wire Spool Holder" by Sisul, and the remix "Spool holder box" by Azuzula. These spool holders are for small electronic hook-up wire, which normally come on plastic spools about 55mm in diameter, and 20mm wide (like https://www.amazon.com/gp/product/B08D6D1TKH and similar).

However, stacking these racks reliably can be difficult, especially with Azuzula's simplified remix design (and this is the one I used for my racks). These simple legs provide solid stacking of either of these modular wire spool holder racks. Though I used Azuzula's design for my racks, I took the exact dimensions from Sisul's FreeCAD design files, so they should work fine with either implementation.

A possible bonus of these legs is that a single 3mm threaded rod can work to hold together both stacked sets of holder racks - at least that is what I am using, and it seems to work fine for me. The modules are well enough designed that they can just "snap" together, and one 3mm threaded rod in the center hole of the legs holds together both tiers of racks. Screws are still required for the top and bottom of each leg. Of course, for better bullet-proof construction, more threaded rods (or glue) can be used wherever needed.

Since either spool holder design requires some space above the racks to lift and remove spools, or to insert them, the top rack needs to swing up out of the way for lower spool removal/replacement. Using only the top screws or a top threaded rod allows pivoting up the top rack (a bit of friction tightness on the nuts or screws helps hold the top rack in the up position).

One each of the left (Spool_holder_stacker-L.stl) and right (Spool_holder_stacker-R.stl) STL files must be printed (or one can be mirrored in your slicer). No supports needed.

My FreeCAD source file is provided if you want to make any changes.