Someone was using a post-it note to remind themselves not to lock the keys in their office. We came up with a catchy solution. The round ring provides just enough friction that an adhesive was not needed. No sanding either!
The part was designed in SolidWorks and printed in ABS.
A friend of min was having trouble sourcing quickly a fitting for a faucet project. The unit had a 3/4 – 20 UNEF (extra fine) thread. We looked up the threads specs and printed a couple of trials. The threads engage nice in general. There is a little swelling at the base where the part sits on the heated bed.
The pipe was designed in SolidWorks and printed in ABS.
The fans for the Rostock come with tiny micro Molex connectors. The spacing is smaller than standard 0.1 inch header spacing. Wanting a sturdy end to the power festoon to the hot end a block was developed that engaged into the top mounting ring. Besides dowels that plug into the existing top plate a round cavity allows for a commercial strain relief to bring the power wire from the stationary part. A couple of square holes allow for plugging in of the micro Molex connectors. Wire was used to make pins guided by holds printed in the block. A groove to interlock the connector orientation was printed as well.
The block was designed in SolidWorks and printed in ABS. Now the fans can be plugged in and the connection of the power wire to the hot end securely fastened.
In getting the parameters dialed in for printing PLA a cooling ring is envisaged to cool the extruded material as it leaves the hot end. This mounts to the bottom of the Rostock Max extrusion platform. Internal baffles and differing size exit holes work to equalize the pressure to make a 360 degree cooling zone. A 25mm fan blows air from the side and gets directed to the printing interface. Eventually a set of clips will be integrated to clip on the axles of the delta unit.
The shroud was designed in SolidWorks and printed in ABS. Once the shroud was in place a connection had to be developed for powering the fan. See later post.
A friend had a couple of golf ball retrievers that had aged and deteriorated. They liked the performance but of course were broken beyond functionality. 3D printing to the rescue. As the design proceeded we realized the assembly could be printed as one pre-assembled piece. Other features included a flared pin to hold the inner ring from falling out and a hex recess for accepting a nut for the mounting 
screw. To get a good pin some sacrificial supports were developed that were removed after printing.
The assembly was designed in SolidWorks and printed in ABS. The Maker community has requested it be posted to Thingiverse. That is the plan but if you’re itching to try it you can download the .STL here. It is also the signature application for a Maker event at the Cumberland Business Incubator Labville. Read about it here.