Spool holder safety extension with filament guide

I realy like the flexible spool holder from @Madaco. I've already used it with my Prusa Mini+, and now also with the new Prusa MK4 because I prefer not to attach heavy spools to the printer's crossbar. Also, this avoids limiting the print height.

I have observed more than once that the spool was pulled off the holder because the force required for this was less than separating the tightly wound strands of filament from each other. Now, with the spools positioned directly above the printer, such an accident can have fatal consequences if a 2 kg filament spool falls from above onto the printer.

So i designed an extension that prevents the spool from being pulled off. At the same time, the extension serves as a filament guide. And the second, narrow hole is designed to securely park the filament when it is not in use.

The model is suitable for spools with diameters ranging from 200 to 300 mm.

Conversion of “Spool holder for Prusa MINI Flexible”

• Remove one rear ball bearing and also the both screws and nuts. The extension fits exactly into the recess for the nuts. 
• Now you can put the nuts back into the extension and tighten the ball bearing with the extension again.
• The original spool holder uses two screws M3-15 or M3-16.  To tighten the extension use two screws M3-20 or M3-22 instead.

Printing information

Layer height: 0.20
Infill: 10%
Support: none

I am looking forward to your Makes! :-)

If you like this design, feel free to check out my others here.

And maybe you would like to support me with a small donation. Feel free to use the support button on the top right of this page. I myself donate one or two Euros to each designer for an interesting model that is worth five stars to me.

The following filament was used in the pictures above:

• Extrudr PLA NX2 neon orange
• Extrudr PLA NX2 black

"Tiltable Spoolholder Extension Lack Enclosure Lid" serves a completely different purpose but served as a template for my design, which is a further extension for “Spool holder for Prusa Mini”.