Prusa i3 MK2S Adjustable Spool Holder

Searching for a solution for some new spools that came with a recent filament order whcih didn't fit on the original holders, I came across Aero3D's remix of a couple of other designs and it was almost exactly what I was looking for.

There were a couple things I wanted in the end that weren't incorporated into his design, so I took what I think are its strengths, rebuilt it in sketchup and added some changes of my own. Primarily I changed the mounting holes/pegs around to allow rotation, and increased the screw thread pitch as I had issues with wobble and found it noisy.

Like the original, Its also designed to be mounted in multiple ways:

1. on the frame top rail in the original orientation/position using 2 top frame mounts.
2. on the top frame rail right side rotated 90deg so the filament still spools off with the least bends (how I wanted to mount mine and the reason for the changes)

3. On the top of a enclosure or flat surface with either screws, the joining plates to connect multiple spools, or with double sided tape.
   This design also uses 4x 608zz bearings, and while screw holes and cutouts are built in to allow the use of M3x12 Bolts and M3 nuts in the frame mount configuration they aren't necessary, it mounts/operates fine without them.

   The posts are also removable allowing you to replace them without reprinting the whole base should one break, they're also reversible if you want to support the spool from the inside edge vs the outside.

   Comments appreciated, let me know what you think!

Print instructions

Category: 3D Printer Accessories Print Settings

Printer Brand: Prusa

Printer: Prusa Mk2

Rafts: No

Supports: No

Resolution: varies (see below)

Infill: varies (see below)

Notes:

Base resolution was .35mm for all parts with the following exceptions:

• the rollers were printed at .20mm,

• the threaded pegs and screw caps were printed at 0.15mm.
  Base Infill for was 5% for all parts with the following exceptions:

• rollers, pegs, posts and screw caps which were printed at 100%

• Due to their high overhang angle printing the rollers I reversed the order of print for them, infill first, perimeters last as on my first try the perimeter loop would fall. Support may also work here, I didn't use any though.
• Watch the print at the beginning of the screw threads on both the posts and caps, I've had issues with the transition from normal printing and increase the flow manually 7% at this point to make sure the threads don't fail.

  Post-Printing

Build & Assembly Notes:

• All parts are designed to be press fit, and most my designs are built tight, so some minor sanding may be required.

• Pressing the bearings into the rollers will take some force, I used a slightly modified version of https://www.thingiverse.com/thing:2275122 which makes bearing installation much much easier.

  1. Press the bearings into the Rollers
  2. Press the hex posts into the 4 holes in the slider and base.
  3. Put the bearings on the posts and thread in the caps.
  4. Thread the screw into the slider, slide into the base guiding the hex end of the screw through the hole and press the thumbwheel onto the end.
  5. Press 2 pegs into each of the selected frame brackets.
  6. depending on which mounting you used refering to the pics is easiest);
     • for the top frame press the brackets into the ends of the base with the screw aligned side to side, place it on the frame and click into place.
     • for top right mounting, place the brackets on the frame first (the top right one slides on from the side with the clip locking it into the z-axis support) press the base down onto the brackets with the thumbwheel towards the front.

  Bill Of Materials:

To complete this build as a frame mount you will need to print:

1x base
1x slider
1x screw
1x thumbwheel
4x roller
4x base post screw
4x base post screw cap
4x peg

• To mount on the top right corner you need:

  • 1x frame bracket top right
    • 1x frame bracket upper
      OR

• To mount in the top middle you need:

  • 2x frame bracket upper

  Revisioning:

  v1.0 - initial release.