Filament Spool Holder Problems and Re-Design
As first post on my site I welcome you with a short description of my self designed filament spool holder and how and why I designed my own:
My first printer was the Anycubic i3 Mega, it came with an acrylic spool holder like this one:
It works fine and I never observed much problems with this one. The i3 Mega is doing it's duty fine since 2018. Christmas 2021 I finally got my next FDM printer, because the Prusa Mini had deliverytimes of about 2 months I decided to try a much cheaper variant. The Kingroon KP3S was available for just 177€.
It arrived quickly and I only had to calibrate the extruder e-steps. I got the KP3S Version 3.0 variant with a Titan extruder (or a clone of it). Here a picture of my current 3D printing setup which fits nicely into my DIY shelf:
It came with a very simple and also common design of a spool holder. It consists of a few ball bearings mounted into a light piece of plastic:
I only tried to use it for short while, because I quickly encountered the first issues, especially with rather empty spools:
The ball bearings were not very smooth-running, but the problem is also that the plastic holders tend to shift around on the desk. So I decided to print a very simple filament spool holder design from Thingiverse: Filament Spool Holder by zachlothe:
I just lightly remixed it in Blender to make a few cutouts on the bottom and scale it down to make it fit on my KP3S. Printing time was about 9 hours. And I used some left over pieces of PLA filament (hence the two colors).
However, it I observed another problem with this spool holder. The KP3S direct drive extruder seemed to have difficulties pulling the filament evenly and so I got uneven layers, which are visible on the left side in the following picture:
The following two short video clips demonstrate other problems with the spool holder. Such as with too light spools the holder could be easily pulled towards the printer. And a heavy spool would not unroll smoothly:
Inspired by many alternative designs on Thingiverse I sat down and designed my own take on a filament spool holder. I had a few M8 screws at hand and I wanted to screw mount the spool holder to my shelf.
You can find the Blender file and the STL files in my Git repositiories:
- Github: https://github.com/WeirdConstructor/3DP_Misc/tree/master/generic_spool_holder
- Self hosted: https://m8geil.de/repo/3DP_Misc/src/branch/master/generic_spool_holder
- Thingiverse: Thingiverse - Generic Filament Spool Holder
You may wonder: *Why call it a generic spool holder? Well thats because it's not a mount for a specific printer, and it will work with almost all filament spools. The dove tail connector will make it future proof for other mounts, such as printer specific mounts or even a desktop stand. I plan to add these at some point.
Here is a short manifest of the required STL files and parts:
And here how it is assembled: