Jump Spool / SMB spool (SCUBA)

thingiverse

A typical size jump/SMB/finger spool, in several line capacities. Printable with no support. Printable on small machines. I have successfully printed these in PLA, ABS, TPE (NinjaFlex), and TPU. (TPU is actually a pretty good choice, since it will flex rather than crack if it gets smashed between tanks, etc. TPE is a little soft, but also okay.) If you print the sides and/or the hub out of a semi-pliable material (TPU, TPE), try the side not labeled "clearance"; parts should fit together firmly depending on the precision of your printer. Use your judgement whether you want glue. If you print all three pieces out of rigid material (PLA, PETG, ABS) (or if your printer is a little loose) then you may need to use the side marked "clearance" -- these leave a little extra room in the mating area. Again, use your judgement whether to use glue based on actual fit, which will depend on the precision of your printer. (The "clearance" side can be visually identified by the presence of a marker dot at the end of the threaded area.) Most of the subcomponents use about 5m of material, so if you have samples lying around, this is a handy way to use them. There are quite a few jump spools on Thingiverse, but I didn't love the designs: they required supports, or required load-bearing gluing, or didn't offer good ways to tweak the line capacity, or etc., so: created this from scratch. The sides are identical, just print two. The sides screw onto your choice of centers: as labeled the centers will make good functional room for 40, 50, or 75 feet of typical #18 braided nylon twine. (They'll probably fit 30% more -- but I find some extra room makes it easier to use.) You probably want to print at 100% infill, just to avoid any concern about internal crush. Comments, make notes, and make pics (especially in-use) appreciated. If you find it useful or learn something, toss a coin to your Designer. <b><i>Scuba diving is an inherently dangerous activity. You assume all risk related to the use of this design. Do not taunt Happy Fun Spool.</i></b> (A couple of the photos are of prototype versions and may have features that changed slightly for the release version.) (Late edit: adjusted the width of the 50 and 75.) (20200814: added a 150+ hub stl, and a zip of some STEP files if you want to import and tweak.)