2020 spool holder

prusaprinters

So here it is - my original design to fit two or four spools into Flying Bear Reborn 2 with the option to lock the spools in place and having the material dry while I'm printing other stuff. Also as I'm doing a frame conversion to the printer to make it into a Reborn Trident, I believe that the original Voron Trident can fit this to accomodate at least one if not two spools internally. I do not own a Voron, so I can't say for sure. Tried out different designs that I found that mount to the 2020 extrusion or derivatives of it. They all had their issues beginning from being too loose or not holding the spool properly and ending with just being plainly too weak and break whenever I wanted to fool around with the printer and make it rumble at high accelerations.I have measured the humidity inside the enclosed printer and it takes about 4 hours printing ABS to drop the humidity from about 30% to about 10-15% depending of the weather outside. So, you can make your printer into a filament dryer and print “straight from the dryer”. Big flex.The total frame height is 95mm with the bolt fully screwed in and whilst mounted on the 2020 profile it goes just 18mm below the mounting surface so no need to worry about the frame touching rear plexi or acrylic if you have it. So, measuring from the mounting surface the part is 77mm high or that's how much space you need between the 2020 profile face and your printer bed.Tested with eSUN, GST3D, Prusament, PRIMA and Spectrum filament spools - they roll smooth and easy.When setting things in slicer I highly recommend to use a modifier cube for the nut to increase the infill to 70% from the bottom to about half way of the threaded part to reduce the chances to break the nut if you happen to overtighten in. Broken threads are pain to get out from the holder, ask me how I know. Other option is to fully print it with 70% infill, you are free do to so. The roll holder can be printed with 0.4-0.42 layer width, 0.2 layer height, 5 walls and top&bottom layers and 40% infill (rectilinear, cubic), similar to Voron specs. I recommend 70% infill around the holes in the holder parts with cube modifiers in a slicer similar to the nut infill modification.Mounting hardware: 2x M4 bolts that are atleast 14mm long and 2x M4 2020 T-nuts for each filament spool holder you make. second piece joins with another 2x M4 bolts that are atleast 23mm long. I do recommend using washers with the bolts if you intent to tighen the bolts stronger than needed.25.02.2024 - I have updated the pieces and split the holder into two pieces which can be printed without supports, so maybe here's a chance to make it a Voron-certified part. Also updated the description. Made the bolt thread a bit shorter, tip chambered and holes into the bolt head so it can be spinned with just a finger if it's loose enough.23.02.2024 - Bought my first big spools of filament and they did not fit to the internal carriers. Modeled an external mounted frame that uses the same “bolt” and attaches to the 2020 aluminum extrusion.Update: it felt a bit flimsy, so I designed another one with removable stud :D