Creality K1 filament spool support with friction control, top mount

Variable spool size support with friction control
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updated April 3, 2024

Description

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Variable spool holder with friction control. Can be mounted directly on top of the printer or on compatible risers (that have the top with the same shape as the printer top).

Example of compatible riser: https://www.printables.com/model/823727-creality-k1-high-risers-with-multifunctions

There are 3 scenarios in witch you will need different 3d printed parts and/ or additional small parts:

  1. Basic model - only support without friction control. For this you will need:
    • Print “1. Side support - left” and “1. Side support - right”
    • 2 x M3 screw with length of minimum 12 mm, preferable 14mm. You will use these screws to fix the 2 suports to the top of your printer or to a compatible riser.
    • Print “3. Shaft”
    • 2 x 608 simple bearing. These are mounted on the ends of the shaft. For this model no additional fixing required.
    • Print 2 x “3. Fixing nut”. You will use these 2 parts to fix the spool on the shaft. Try to center the spool as much as possible on the shaft and also center the spool on the conical part of the fixing nut. The more you miscenter the spool on the fixing nuts, the more of an elicoidal rotation you will obtain.
    • Optional: print “2. Filament guide - low” or “2. Filament guide - high”. The proper guide or no guide at all depends on your custom configuration. Elements that afect best configuration:
      • if you mount on the printer or on risers
      • height of risers
      • diameter of the spool
      • type of filament (TPU vs other type)
      • amount of filament left on the spool
  2. Intermediate model - with basic friction control. For this model you will need all parts from basic model + the following:
    • Print 2 x “4. Screw cap”
    • 2 x M3 nut
    • 2 x M3 screw, with lenght of 20 mm.
    • You will use the screw cap+nut+screw to create an assembly. You obtain 2 assemblies that look like this: These are the screws that will control friction.
    • 2 x M3 nut for heat insertion. They look like this: These nuts need to be heated and inserted into the Side Supports, on the side (not top), in this area:
    • With this model you will have only partial friction control (you can reduce ~30-50% of the spool speed).
  3. Advanced model - full friction control. For this model you will need all parts from intermediate model + the following:
    • glue the inner ring of the 608 bearings to the shaft. I used very little super glue + added some flexible adhesive that hardens in 24 hours. You can use all super glue, but be carefull not to put an excesive amount and not glue also the outer ring.
    • print “5. Bearing cap with hinges - left” and “5. Bearing cap with hinges - right”
    • 6 x M3 nut for heat insertion, 3 on each side. 1 nuts will be heated and inserted in the cap with hinges, like this: , 2 nuts will be heated and inserted in the top part of the supports:
    • 2 x M3 screw with a lenght of 8 mm. You will use these 2 screws to mount the fixed part of the cap with hinges to the side supports:
    • 2 x M3 screw with a lenght of 16 mm + print 2 x “4. Screw cap” + 2 x M3 nut. You will create again 2 assembly of fixing screws from: screw cap + screw + nut: These assemblies will be inserted in the mobile part of the cap with hinges.
    • The cap with hinges closes over the bearing. This way you will create enough friction/ pressure so that the outer ring of the bearing doesn't rotate:
    • NOTE: if you have issues here you can add a very thin layer of silicone inside the cap with hinges, so this should fix the outer ring. I did not need this step.

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