I wanted to test out a rolling spool holder setup on my 3D printer, a Creality K1 Max. While there is a plethora of models available, it does not appear that many accommodate filament spools with small diameter hubs (e.g., Sunlu 0.25kg spool with a 42mm diameter hub). Also, many of the models that utilizes bearings, have them loosely resting on top. I do not want the bearings to fall out, even if the printer was completely upside down.

• This 3D model has been verified to fit the Creality K1 and K1 Max (may fit others).
• This 3D model will fit in the original location on the printer.
• This 3D model will twist and lock in place just as the original spool holder does.
• This 3D model utilizes bearings which are captured by the print and will not fall out.
• This 3D model will theoretically accommodate filament spools with a hub size as small as 38.5mm (smallest spool hub size I had in my collection was 42mm).

NOTE
 -This 3D model requires supports which will require post processing.
 -The twist-lock feature might require moderate force to initially lock the holder in place.
   This was my experience but only when printed in PETG.
 -This 3D model utilizes bearings which are a press fit.
   I was able to install them by hand but tools may ease installation.

Bill of Materials:
 (2)  608RS or 608ZZ bearings (22mm O.D. x 8mm I.D. x 7mm wide)

Tool(s) used:
  Flush Cut Shears (ones that came with my printer)
  Pocket Flathead Screwdriver (used to scrape out support material)

Equipment used in printing:

 Printer
  Brand: Creality
  Model: K1 Max
  Specs: unmodified printer, factory PEI smooth build plate

 Slicer
  Creality Print 5.0

 Print settings used
  Layer Height: 0.16mm
  First Layer Height: 0.2mm
  Wall Loops: 5
  Top Shell Layers: 6
  Bottom Shell Layers: 6
  Infill Density: 35%
  Infill Pattern: Gyroid
  Support and/or Bed Adhesion:
   [Normal (Auto) – for roller],
   [Tree (Auto) – for base],
   [None – for end plate]
  On Build Plate Only: ✔
  Nozzle temp for PETG was set at 250c for the roller, 270c for the rest

Material(s) tested:
 Kingroon PETG – nozzle temp @ 270c, bed temp @ 80c
 Handini PLA – nozzle temp @ 220c, bed temp @ 60c