Dental Alginator 2 Worm Gear

thingiverse

If this design saves you time or money, please tip me to support my continued development. This is a replacement worm drive gear for a Cadco Alginator 2 alginate mixer. Manufacturer claimed to no longer sell replacement parts for this unit and no one likes throwing away a perfectly functional piece of equipment and having to buy an entire new unit for $300 when you can print the broken gear for ten to twenty cents worth of 3D filament. Odds are after 15 or 20 years your old unit stopped working and upon disassembly all that was worn was the plastic planetary gear, but the metal worm drive gear, motor, electronics, and everything else are fine. Don't waste your money, just print this and repair it. Don't have a 3d printer? Great excuse to get one. You can buy a handful of very capable 3d printers for around $200, a roll of ABS filament for $20, and you can make this yourself. This part in ABS needs a 3D printer than can reach extruder temp of 235 C and a bed temp of 110 C. That's $80 saved over buying a new mixer unit and you now can make tons of other parts. If you don't want to do that reach out to me and I can print and ship it to you for a donation or tip. I have printed and tested this part in ABS only, will update if ABS proves not to be up to the task. A better filament to use would be POM – Polyoxymethelene aka Acetal/Delrin type filament with more appropriate material qualities for such a gear. A roll of POM is $27 or so on common sales sites. I have not tested POM material yet so I cannot advise on printer/slicer settings, the following print settings are for my tested ABS part only. At the settings below this gear printed at the highest quality tailored for ABS in about 90 minutes. ABS is tricky, so you will probably spend more time getting proper bed adhesion and than anything else, so time to learn. Quick tips...spray the print area of your bed with hair spray or whatever ABS adhesion trick you prefer. If you do not have an enclosure for your 3D printer, you can improvise with a large cardboard box (make that a very large box with ample clearance since cardboard + hot parts = fire hazard). I was able to do this on an Ender 5 Plus (3 pro is more than adequate fyi) with no enclosure, but I had to keep the room it was in closed, keep the air still, and let it heat up for about an hour before the bed temp stabilized well. I use Cura 4.4 slicer, so if you don't see the settings I'm referring to in your slicer options change the view to show all settings and/or just use Cura 4.4 (Cura is free). Use this design and information at your own risk. This requires maximum bed temperature for many 3D printers.