DIY 3d printed rotary evaporator.

https://www.youtube.com/watch?v=MGEMQTo0t2g

In addition to the printed parts you will need:

• Four M3x6 screws
• Six M3x30 screws
• Six M3 nuts
• A JGY-370 geared motor (12V DC, 25RPM - would recommend trying a faster version though) - eBay
• A 24/29 extension tube - Aliexpress link
• A 24/29 PTFE stirrer bearing (UNMODIFIED) - Aliexpress link
• Short length of 7mm OD PTFE tubing
• 8mm dia rod for clamping

Put a tiny bit of joint grease on the O-ring in the stirrer bearing, and a whole load of grease on the outside of the stirrer bearing joint.

I've been using this design for a while now and it works pretty nicely. The main issues are that the rotation speed is a bit slow (with 25RPM motor) and it's cumbersome to adjust the height because the condenser and spinny thing are clamped to the stand separately. I'll probably redesign it to address this at some point, but I haven't gotten around to it because, well, it works. If I do I'll upload it as a separate thing.

I now use a slightly different glassware setup than that shown in the video, though. I use a coil condenser (NOT a Graham) instead of the Leibig condenser. I use a tubing adapter with a stopcock for the vacuum pump connection. And instead of using two stirrer bearings and that strange T-piece, I now use something that resembles the 24/29 extension tube but with a hose barb on it in the middle. I connect that to the PTFE tubing with a short length of Tygon A-60-G tubing, PTFE tape, and cable ties.