Trident - Internal Spool Roller - Front PTFE Guiding

Often cardboard spools are quite rough and tend to jump out of position with a onesided spool holder, therefore i designed an internal spool roller with 4 individual rollers. Moreover you are able to load the filament from the front, which makes life way easier.

Pros : 

• Cardboard safe - 4 individual rollers for safe rolling

• Multiple spool size - 55mm up to 70mm spools

• Front loading the filament into the PTFE tube - way easier

• Uses easy to source 625ZZ bearings - every Ender3 wheel contains two of them

• Chamfered outer rollers - makes loading the spool easier

• You can mount the roller left and right - Mirrored STL's are provided

Cons:

• Protrudes over the acrylic deckplate - you need to remove the spool rollers if you want to work on your reverse electronics bay

• …design is not yet longterm tested - you are a tester!

BOM :

• 6x 625ZZ bearings

• 1x ECAS04 PTFE adapter

• 1x M3 heatset insert

• 1x M3x8mm screw

• 2x M5x12mm screw (flathead)

• 2x M5x16mm screw (flathead)

• 2x M5x20mm screw (flathead)

• (Optional - 10mm wide, 2mm thick silicon spacers)

Note : 

The roller contains two 1,7mm deep pockets on the inner legs, you can glue in some 2x10mm silicon pads to prevent scratching and vibrations on the acrylic deckplate

UPDATE : 

• 18.04.2026 - uploaded CAD files

Printing : 

Recommend printing in ABS/ASA due to heat. 4 walls, 20% infill. Outer rollers are a bit tricky to print due to the chamfers - print slow!

Join the cursed side and build an Ender3Dent too!
https://github.com/yell3D/Ender3dent