StackRing FREE Fit-Check Segment — 5-Gallon Bucket Stacking Spacer (TEST-FIT BETA)

⚠ TEST-FIT BETA — PLEASE READ FIRST

This is a FREE single fit-check segment for the StackRing 5-gallon bucket stacking spacer. It is geometry-verified and slice-tested, but the design has NOT yet been fit-tested on physical buckets — fit on your buckets is not guaranteed. That is exactly what this free segment is for: print ONE segment, test it on your buckets, and only then decide on the full set. Gamma Seal lids are NOT supported in v1.

What this segment does

The full StackRing is three identical 120° arc segments that key together with dovetails into a Ø308 mm ring (13.8 mm overall height) that sits between two stacked, lidded 5-gallon buckets. A channel on the ring's underside registers over the lower bucket's rim/lid edge, and a cradle on top locates the upper bucket's base foot — the design intent is to route the upper bucket's load rim-to-rim, around the lid centre. This free download is ONE of those three segments, so you can check the channel against your bucket's rim and the cradle against your other bucket's base foot before spending anything.

Designed-for targets (design targets — not verified fits)

Standard 5-gallon buckets with a top diameter of about 300–302 mm: the common big-box bucket families (Home Depot / Lowe's / Tractor Supply style) and food-grade buckets of the same nominal size. Measure your bucket's top diameter first. Gamma Seal lids change the top profile and are NOT supported in v1. Other sizes (3.5-gallon, 6-gallon, off-brand) are not claimed.

Printing

PETG, 0.20 mm layers, 35% infill, no supports. The file is pre-rotated 43° in-plane (corner-to-corner diagonal) — keep it flat, don't tilt it on edge. One segment: ≈ 68.5 g, ≈ 1 h 51 min on a Bambu P2S.

Get the full set

The complete StackRing STL set — all three segments plus the clip-on content/date dial pod (detented month and year wheels and a content-card tray, so no bucket stays a "mystery bucket") — is here:

https://forgefilament7.gumroad.com/l/eigzyf

Tell us how it fit

Fit reports are the point of this beta. If you print this segment, tell us your bucket brand and how it fit — in the comments here, or through our quote/contact form: https://forms.gle/ssAHAqwt33uebFjb8

Fit data across bucket brands drives the v1 fit list.

What we're NOT claiming

StackRing carries no load rating. We make no claim that it prevents cracking, reduces lid deflection or creep, or makes any particular stack height safe — those physical tests are still ahead of us, and this listing will only ever claim what we have actually measured. The ring contacts bucket exteriors and rims only; 3D-printed parts are not certified food-safe.

Designed by Forge & Filament, Denver CO.