Atomic Filament 3.5 kg spool — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/atomic-filament-3-5-kg-spool/  (sheet CC BY 4.0)
Basis: Manufacturer specifications (Atomic Filament)
Catalog version: 2026-10-20

Overall (mm): length 304.8, width 304.8, height 95.25
- The Atomic Filament 3.5 kg spool measures 304.8 mm across the flanges, 95.25 mm wide, with a 50.8 mm hub hole, as published by Atomic Filament.
- Atomic lists this spool as 12 × 3.75 in with a 2 in hole without labelling which figure is which; following its 1 kg wording (diameter × thickness), 12 in is taken as the diameter.
- The file is a solid envelope cylinder at the outer diameter and width with the hub hole through it; flange thickness, core diameter, ribs and windows are not modelled.
- True size, no printing tolerance added. Only published numbers are used; anything not published is said so.

dimension  value
Outer (flange) diameter  304.8 mm (12 in)
Width  95.25 mm (3.75 in)
Hub hole diameter  50.8 mm (2 in)
Published size  12 in × 3.75 in × 2 in hole
Empty spool weight  936 g
Filament capacity  3.5 kg

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Atomic Filament: FAQ - Atomic Filament — web — Publisher's page; dimensions are facts — https://atomicfilament.com/pages/atomic-filament-faq

Free files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/atomic-filament-3-5-kg-spool/index.json
API: https://xemstudio.com/api/geometry?object=atomic-filament-3-5-kg-spool