2020 Filament roller for 608 bearings

thingiverse

The split pins on fixitnate's version has a problem with snapping - likely a combination of direction of print and the fact that only the top half of the pin holds the weight of the spool. This version has a solid pin to try to add a little extra strength at the expense of the superior retention of the split pin. These won't fall off in normal use, but the bearings are able to pull off more easily (one kept falling off while I was trying to snap it on the rail).The upside is that these can be used with a more rigid plastic without cracking the pins. This design is fully compatible with the Rollin on 20s roller (bearings are slightly lower, but the spacing is about the same) so if you can print it as a replacement for just one side if you have a cracked pin. SolidPin-Snug hasn't been tested, but it's not a vast deviation from the "bit of tolerance" version, which was printed (and I'm using). The only difference is I added 0.2mm of plastic to the top of the clip (taking it from a technically perfect 7mm down to 6.8mm space) and I added a chamfer to the inside corner of the clip bits that grab the 2020 rail and give a slightly stronger pinch, which with any luck should wear down a little to fit perfectly. A little file work can fix it if I am wrong. I'll try printing this when I get the chance, but right now I have two rollers that work and a spare already, so I'm going to call it. I'm leaving the other ones because you may not be the adventurous type, in which case you can print one that there is proof it works and fix it. I'll remove the lesser versions if/when I test the theoretically better one. I've also included the Fusion 360 file in case anyone wants to take a crack at it themselves. You just have to promise not to judge me for my terrible CAD skillz when you see how I made it. The "bit of tolerance" version works almost perfectly. The 2020 clip is a little loose, allowing it to slide freely, which could be a problem. 3-4 layers of painters tape on the top of the rail helps. Alternatively you could wrap a rubber band around the two rollers (above the rail, below the plate) and just use the spool to hold them apart, but that may cause too much friction with the spool on the edge of the pin plate. if you print without supports you will need to remove a few loops of material where the bearing goes, but with a little force the bearing snaps on, and isn't prone to coming off by accident. The clip goes on the rail with a little effort, even if it is a little loosey-goosey once it's on. This "too tight" version has -no- wiggle room. You will need a file or sandpaper to make this fit anything. I will fix that soon. For now, you will need to remove some plastic from the bearing retention disk, a little from the bearing shaft, and a lot from the 2020 clip part (the bit that has to go over the top of the 2020, but inside the edge of it). Rounding it a bit helped, and printing at a lower infill with fewer side perimeters would also help (increase the springability of the clip). The upside is this allows you to get a perfect fit, if you have a lot of patience and some good needle files. The 2020 clip is still loose though. Print Settings Printer: Folger Tech Kossel revB Rafts: Doesn't Matter Supports: Doesn't Matter Resolution: 0.3mm Infill: 20% Rectilinear Notes: Infill is likely unimportant, and as long as you have solid surfaces you should be good. Fewer vertical walls (I did two, and it clipped on perfectly) and less infill makes it easier to get the clip over the rail. I doubt doing higher infill would make much of a difference for the function (it's pretty solid). No feature is very small, so resolution is extremely unimportant. I predict anything up to, and including a 1mm resolution would print this well enough to be used. It may not be pretty at that size, but how pretty does it need to be? Print it flat on its back (pins up) for easier printing. The bearing cap has an overhang, but if you just print in mid air it will eventually recover and you can just file off the dangling loops. Or use supports - it will make it a little prettier, but also more plastic and time. Printing SolidPin-a bit of tolerance