Prusa USS Drybox Carrier — Wall mount system

Compact wall storage for Prusa USS dryboxes, with each box removable on its own. Slim aluminum Z-rails mount directly to a suitable wall or solid back panel: no shelf or freestanding frame required.

Start with one drybox or arrange rows of two, four, eight or more. Carriers can be inverted for outlets facing up or down. Use them for sealed storage or beside a printer. Our planned installation is four across by two rows to the right of a CORE One with an eight-tool INDX upgrade; feed-path validation is still pending.

CHOOSE YOUR CARRIER

V1 Solid — the original solid-wall carrier, retained for those who prefer its simple enclosed appearance.

V2 Perforated — the final thinner carrier with uniform 8 mm hex openings, rounded corners and solid material around the mounts. Upright hexes point upward for printing, and teardrop insert holes reduce unsupported roofs. The complete spindle socket is integrated into both versions.

ONE CORE PER REEL

Print one included Prusa Universal Spoolholder (1 kg), universal-spoolholder-1kg-r1.stl, for every reel/drybox. This removable core locks into the carrier’s socket for extra-secure retention. No separate puck is needed. The Prusa core STL is supplied unchanged and credited below.

PARTS PER DRYBOX

• One carrier, one USS Drybox and one Prusa core.

• Two standard Monarch MF375 2-inch clips with staggered holes.

• Four M4 heat-set inserts: V2 uses 6 mm-long inserts; V1 uses 8 mm-long inserts. Fit eight inserts if you want both mounting orientations ready.

• Four low button-head M4 screws. With nominal 3.2 mm clip thickness, use M4×8 for V2 or M4×10 for V1; check head clearance and avoid bottoming out.

Per row: two matching MF375 wall rails, cut to length, with fasteners suited to the backing and loaded weight. A 4×2 array uses eight carriers/cores, sixteen clips, thirty-two screws/inserts and four rails.

ASSEMBLY

Clip groups are 100 mm apart. Fit two clips per carrier, with their engaging lips facing down; use the alternate holes when inverting the carrier. Mount matching rails level and parallel. Leave at least 13 mm above each carrier for lift-off, plus room to pull it forward and handle tubing. Fit the drybox and lock it with the removable core. The carrier is intentionally snug; test one before printing a complete array.

V2 insert seats are 5.5 mm diameter with a teardrop roof, 7 mm deep in a 9 mm mounting wall: a 6 mm insert has 1 mm of depth clearance and 2 mm of solid backing. Insert dimensions vary, so check your hardware first.

PRINTING

The STL and PETG 3MF files are oriented for printing. STEP files retain the CAD orientation. The PrusaSlicer 3 projects use CORE One, Generic PETG and a standard 0.8 mm nozzle: 0.30 mm layers, 20% cubic infill, four top/bottom layers, and local 100% reinforcement around the inserts and socket. V1 has three perimeters; V2 has two. Supports and brim are off. Keep the local reinforcement modifiers.

Slicer estimates per carrier: V1 ≈426 g / 6 h 55 min; V2 ≈321 g / 6 h 49 min. V2 saves about 25% filament. Estimates vary with slicer and profiles; they exclude the separate core.

Print the Prusa core using its source recommendation: PETG or PC, 0.20 mm structural profile, 15% grid infill.

TESTING & CREDITS

Earlier solid and perforated prints have been fit/stiffness checked. The final V2 point-up holes and revised insert backing have CAD and slicer checks; a print test is still needed. Long-term loaded hanging and INDX routing remain unverified. No load rating or anti-lift latch is provided.

Prusa core and original puck interface: Prusa Research, USS Drybox printable accessories (Open Community License v1 as listed on the source):

https://www.printables.com/model/1605113-prusa-uss-drybox-printable-accessories

MF375 dimensions:

https://www.monarchmetal.com/technical-drawings/pdf/MF-375.pdf

Example rail kit:

https://www.amazon.com/dp/B0FN4XLQZC

Independent community accessory. AI assisted with geometry, slicer configuration and documentation. Earlier development versions are archived; V1 Solid and V2 Perforated are the two current options.